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Reel Döviz Kurları Üzerindeki Şoklar Geçici Mi, Kalıcı Mı? Dalgacık Tabanlı Birim Kök Testleri İle Kırılgan Sekizli Ülkeleri İçin Bir Uygulama

Authors:

Abstract

Bu çalışmada, kırılgan sekizli ülkelerinde reel döviz kurlarına gelen şokların etkilerinin geçici mi yoksa kalıcı mı olduğu dalgacık tabanlı birim kök testleri ile incelenmiştir. Bu kapsamda, kullanılan verilerin zaman aralığı, 1994 Ocak - 2020 Ağustos dönemini kapsamaktadır. Öncelikle seçilen ülkelerin reel döviz kurları üzerinden doğrusallık testleri yapılmıştır. Sonuçlar çerçevesinde doğrusal olmayan serilere dalgacık tabanlı doğrusal olmayan FWKSS ve WKSS testleri uygulanmıştır. Fourier terimi tüm ülkeler için anlamlı bulunmamıştır. Dolayısıyla FWKSS birim kök testi sonuçlarının tüm ülkeler için yorumlanamayacağı görülmektedir. Bu sonuç, WKSS birim kök testinin ülkeler için kullanılması gerektiğini göstermektedir. WKSS testinin sonuçlarına göre, sadece Arjantin ve Güney Afrika'nın reel döviz kurları % 10 anlamlılık düzeyinde durağan iken, diğerleri birim köke sahiptir. Sonuçlara göre şokların reel döviz kuruna etkileri Arjantin ve Güney Afrika'da geçicidir. Ancak reel döviz kurundaki şokun etkilerinin Brezilya, Şili, Hindistan, Endonezya, Rusya ve Türkiye'de kalıcı olduğu görülmüştür.
Makale Geliş Tarihi / Received
: 30.11.2020
DOI: 10.21076/vizyoner.832853
Makale Kabul Tarihi / Accepted
: 08.06.2021
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.

REEL DÖVİZ KURLARI ÜZERİNDEKİ ŞOKLAR GEÇİCİ Mİ, KALICI MI? DALGACIK
TABANLI BİRİM KÖK TESTLERİ İLE KIRILGAN SEKİZLİ ÜLKELERİ İÇİN BİR
UYGULAMA
ARE SHOCKS ON REAL EXCHANGE RATES TEMPORARY OR PERMANENT? AN
APPLICATION FOR THE FRAGILE EIGHT COUNTRIES BY WAVELET-BASED UNIT
ROOT TESTS
Dr. 
1
ÖZ
 ,         
, 1994 Ocak - 2020 
     
 Fourier
              



              
.
Anahtar Kelimeler: 
JEL Sınıflandırma Kodları: F31, F41, C22.
ABSTRACT
In the study, it is investigated whether the effects of shocks to real exchange rates in the fragile eight countries are temporary
or permanent by wavelet-based unit root tests. In this context, the time range of the data used covers the period between 1994
January - 2020 August. Firstly, linearity tests are performed on the real exchange rates of the selected countries. Within the
framework of the results, the wavelet-based nonlinear FWKSS and WKSS tests are applied to the nonlinear series. The Fourier
term is not found to be significant for all countries. Therefore, it is seen that the FWKSS unit root test results cannot be
interpreted for all countries. This result shows that the WKSS unit root test should be used for countries. According to the
results of the WKSS test, only the real exchange rates of Argentina and South Africa are stationary at 10% significance level,
while the others have unit-roots. According to the results, the effects of shocks on the real exchange rate are temporary for
Argentina and South Africa. However, the effects of the shock in the real exchange rate are found to be permanent for Brazil,
Chile, India, Indonesia, Russia and Turkey.
Keywords: Real Exchange Rates, Permanent and Temporary Shocks, Wavelet-Based Unit Root Tests.
JEL Classification Codes: F31, F41, C22.
1
, mademir@kastamonu.edu.tr
886
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
EXTENDED SUMMARY
Purpose and Scope:
Shocks affecting real and nominal exchange rates are generally referred to as real and nominal shocks in the international
economic literature. The sources of permanent and temporary shocks on exchange rates have been a lengthy topic in
international economies. Many arguments show that macroeconomic shocks perform a key role in understanding the evaluation
of real exchange rates. At this point, another important issue is the purchasing power parity (PPP) hypothesis. PPP is the ratio
of the purchasing power of a country's currency to the purchasing power of another country's currency. If the PPP hypothesis
is valid, the real exchange rate remains in stable equilibrium in the long run. Deviations in the real exchange rate indicate that
there are deviations from PPP. From this point of view, studies on real exchange rates can be regarded as identical with the
studies that test the PPP hypothesis. At this point, considering the effects of shocks on the real exchange rate, if the real
exchange rate series includes unit root, the effects of shocks on real exchange rates are permanent and the PPP hypothesis is
invalid. In cases of shocks occurring in a variable that is temporary and permanent, a price variable is analyzed econometrically
by unit root tests. Therefore, since the exchange rate is also a price variable, it is examined econometrically by unit root tests
whether the shocks occurring in a variable are temporary and permanent. If the real exchange rate data series is stationary, the
shocks in the exchange rate are temporary, and vice versa, it is nonstationary, meaning shocks are permanent. Therefore, the
purpose of this study is to examine whether the effects of economic shocks on real exchange rates in the fragile eight countries
are permanent or temporary with wavelet-based unit root tests.
Design/methodology/approach:
If a variable is stationary, that is, if the effects of shocks are temporary, it is possible to obtain predictive values of such a
variable. On the other hand, it is not possible to make future predictions for a non-stationary variable where the effects of
shocks are permanent. Time series analysis can be performed in two different dimensions. The first of these is time and the
second is the frequency dimension. Almost all of the unit root tests in the literature perform time-scale analysis. However,
ignoring the frequency information may cause the results to be deviated, especially for high-frequency time series. Therefore,
wavelet-based unit r 
(2019b) introduced the first unit root test that allows wavelet-based nonlinear and soft structural breaks in the literature. In time
series, sometimes the stationarity may not be I (0) or I (1) but in the form of fractional numbers 0 <d <1. The hyperbolic
reduction in autocorrelation functions of high-frequency time series, long-term dependency, and tendency to slow average is
defined as long memory properties. Therefore, fractional unit root tests can be used in a series with a long memory feature. In
the study, GPH (Geweke Porter Hudak) fractional unit root test (1983) was conducted to test the long-term memory properties
of the series before proceeding to nonlinear unit root tests. Subsequently, wavelet-based unit root tests, in which time and
frequency information are together, have been performed in the study. For this purpose, firstly, to determine the correct analysis
method, whether the variables have a linear structure or not were examined with the BDS test. According to the linearity test
results, all variables showed a nonlinear structure. Accordingly, the stochastic properties of all variables should be examined
by nonlinear unit root tests. In this case, FWKSS and WKSS tests were applied to the variables.
Findings:
In the study, GPH fractional unit root test was conducted to test the long-term memory properties of the series before proceeding
to nonlinear unit root tests. According to the results, the H0 hypothesis established as d = 0 is rejected in the real exchange rate
series of all countries. The rejection of the null hypothesis that there is no long memory indicates the existence of unit root. In
the study, wavelet-based unit root tests were carried out in which time and frequency information were together. For this
purpose, firstly, to determine the correct analysis method, whether the variables have a linear structure or not were examined
with the BDS test. According to the linearity test results, all variables show a nonlinear structure. In this case, FWKSS and
WKSS tests were applied to the variables. The Fourier term was not found significant for all countries. It is seen that the
FWKSS unit root test results cannot be interpreted for all countries. This result showed that the WKSS unit root test should be
used for all countries. According to the results of the WKSS test, the real exchange rates of only Argentina and South Africa
are stationary at the 10% significance level, while the others have unit-roots. Consequently, the shocks have temporary effects
on the real exchange rate in Argentina and South Africa. However, the impact of shocks to the real exchange rate is permanent
in Brazil, Chile, India, Indonesia, Turkey, and Russia. Besides, when we examine the study in terms of the PPP hypothesis, the
PPP hypothesis is valid in Argentina and South Africa. However, the PPP hypothesis is not valid in Brazil, Chile, India,
Indonesia, Turkey, and Russia.
Conclusion and Discussion:
In economies where shock effects are permanent, macroeconomic factors affecting real exchange rates should be well-
identified and policymakers should revise these factors. It is accepted in the literature that real shocks may arise from the supply
or demand of the economy and that the effects of these shocks on both real and nominal exchange rates will be permanent.
Real shocks in the economy are caused by technology and thus productivity change, pandemic, and natural disasters, etc.
Monetary and fiscal policies are relatively ineffective in the solution as they are mainly caused by these factors. Therefore,
structural reforms affecting the economy, in the long run, should be implemented by countries. Correct monetary policy
decisions to be applied in economies where the effects of shocks are temporary will further reduce the temporary effects of
shocks.
887
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
1. GİRİŞ
    


  
  

15: 82).
     

             


         
         
olabilmekte ve po
    
nelik son de
,  Bununla
  

, 
ekonomi literat
        5491). Bretton Woods'un

esnek-, 
 


(Wong, 2020: 1). 
   

            

Burada  bir nokta da  
. 
      
 kurda meydana gelen
          
          
            


 e
-Gasaymeh vd., 2015:32).
  
ile incelenmektedir 
              
incelen, tam tersi
, 
888
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.


       .     
E

    
             

 Asya ve Latin Amer ,        

, bu

           lik


   

           
nde in 
 te olan piyasa


      

             
 
Chowdhury, 2004: 697-698).
Bu nedenle da, de 

              
   
a  bir 


2. LİTERATÜR TARAMASI

, 
da mevcut olmakla birlikte, bu

  
               
  
viz kurunu etkilemektedir.
     
   

         
, 
,    
        n    
889
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.


daha 
, 
    ,        
   lar        ,
a , bir
-
              


,  

           ru

            






         , nominal
             
belirtmektedir.
, 
ve 

               


            



 , Hindistan 

             
hareketleri  
,   bir  

Tablo 1de SAGP hipotezinin 

890
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
Tablo 1. SAGP Hipotezi 
SAGP Hipotezinin Geçerli Çıktığı Çalışmalar
SAGP Hipotezinin Geçersiz Çıktığı Çalışmalar
Rodrigues-Benavides vd. (2018), Taylor
-, Anorou
vd. (2002), Triki ve Maktouf (2015), McNown ve
Wallace (1989),    ,
Mahdavi ve Zhou (1994)
Dal Bianco (2008), Al-Gasaymeh vd. (2015), Ralph
 

      
      
-Lee-  
Rodrigues-Benavides vd. (2018), Taylor
-, Peng vd.
(2017), Triki ve Maktouf (2015), Chen(2017),
, Mike ve
   

 , Mahdavi ve Zhou (1994), Su vd.
(2012)  
      
olan sabit+kukla+trend modeline g


      , Alper
      
(2020)      
Bozkurt    
    
    
      ,
Atasoy(2016), Gyamfi ve Adam (2017), Gyamfi
(2017), Bahmani-   -i
Silvestre Birim , Al-Gasaymeh vd.
(2015), McNown ve Wallace (1989), Ralph Lu vd.
,
Vasconcelos ve Junior (2016)   
(2018)
      
 Bozgeyik ve
 , Rodrigues-Benavides vd. (2018),
Arize (2011), Al-Gasaymeh vd. (2015), Jiang vd.
(2015), Triki ve Maktouf (2015), McNown ve
Wallace (1989),  
    , Bal vd.
(201,
Vasconcelos ve Junior (2016)
Ralph  

     
       


(2017), Bahmani-   -i
, Peng vd. (2017),
Al-Gasaymeh vd. (2019)   
   , Su


 
 
    
   Mike (2019), Atasoy(2016),
Gyamfi ve Adam (2017), Gyamfi (2017), Sidiq ve
Harawati (2016), Chen(2017)  
    
      
sabit+kukla+trend 
Bahramian ve Salimine  
(2019),   ,
    
  Atasoy(2016), Triki ve Maktouf
(2015), Chen(2017), Nusair (2003)

      (2015),
    
    ,
Bahmani-   -i Silvestre
, Al-Gasaymeh vd. (2015),
  
      

      
sabit+kukla+trend 
891
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
SAGP Hipotezinin Geçerli Çıktığı Çalışmalar
SAGP Hipotezinin Geçersiz Çıktığı Çalışmalar
, Bozgeyik ve

   ,   
-Lee-  
    , Arize (2011),
Peng vd. (2017)
 , Su vd. (2012)
      
Model olan sabit+kukla+trend 
 
      
   ,
    
  Gyamfi ve Adam (2017), Gyamfi
(2017), Bahmani-   -i
    , Bahmani-
Oskooee vd. (2015)
     
       
 , Bozgeyik   ,
, Anorou vd. (2002), Arize
(2011), Peng vd. (2017)   
   ,
   , Kyei-Mensah
,
Mahdavi ve Zhou (1994)

      
    
     Atasoy(2016) ,
Gyamfi ve Adam (2017), Gyamfi (2017), Bahmani-
-i 
 , Gyamfi ve Appiah (2019
Metodu       
      
olan sabit+kukla+trend 
 (2009),
 
  

       
   
    ,
      
      
      
Im-Lee-  

(2018)     
       
      
    Tolgay ve Kula (2020),
Tolgay ve Kula (2019),   




(2020)
       
Karabacak (2017),  

   -Strazicich Birim
   Atasoy(2016), Bilgin
     
(2007), Konat ve Temiz (2019), Bahmani-Oskooee
-  
, Al-Gasaymeh vd. (2015), Jiang vd. (2015),
Mahdavi ve Zhou (1994)  ,

Gnd ,
     

, lerinden 
nokta, liter  
 testini 
3. EKONOMETRİK METODOLOJİ
Bir  Bunlardan ilki,  
etkilerinin   yoksa         , serinin bir
     
, 
gerek yoktur. Se
             
serilere ait gelecek tahminlerinin   
    
          gelecek tahminlerinde
   ,       
       uygulanan   
-10).
892
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
          
        ,       
 de
 
stesinden
 
bilgi gerektirmeden, ni 
,     


ve -11).
Zaman serilerinde analizler zaman ve f     
          
           
  

testi,             
ni b) ise, 
 ,  

-12).


 

 t = -1 (1)
kesikli dalga
 

 t = -1 (2)
E               
 
           
b
KSS  metodolojisine (Kapetanios, Shin ve Snell, 2003) 
ni 
2019b: 2-3).

   
 
 (3)


 

(4)
burada               
b: 4).
 
          
;
   (5)
E 
893
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
    

 (6)
E 


kan, 2015: 25- b), Fourier WKSS (FWKSS)

   
 
  
 (7)
Burada V1,t 
             E   
             
-, 

bb)
, 
b: 5).
Zaman serileri          

      linde olabilir.     

   bir seride 
testleri             
n
       
).
4. VERİ SETİ VE AMPİRİK BULGULAR
- 

i

Ek1Bu sayede zaman serilerinde
  ar ,           
       ,     
GPH (Geweke Porter Hudak) p
birim ktesti (1983) s da Ek  Ek 2 = 
H0             

         
    esas olarak       
             
         2   

894
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
Tablo 2. 
Boyut
BDS İstatistiği
Standart Hata
Z-İstatistiği
Olasılık Değeri
Arjantin
2
0.203346
0.003721
54.64797
0.0000
3
0.344000
0.005868
58.62739
0.0000
4
0.440539
0.006931
63.56244
0.0000
5
0.506443
0.007165
70.68586
0.0000
6
0.550881
0.006852
80.39375
0.0000
Brezilya
2
0.178065
0.002709
65.72836
0.0000
3
0.297416
0.004289
69.35191
0.0000
4
0.376239
0.005084
74.00726
0.0000
5
0.426112
0.005274
80.80062
0.0000
6
0.456672
0.005061
90.23759
0.0000
Şili
2
0.159650
0.003193
50.00481
0.0000
3
0.263867
0.005063
52.11306
0.0000
4
0.329482
0.006014
54.78388
0.0000
5
0.367644
0.006251
58.80964
0.0000
6
0.387711
0.006011
64.49499
0.0000
Hindistan
2
0.153679
0.002839
54.12597
0.0000
3
0.256294
0.004495
57.02160
0.0000
4
0.322883
0.005329
60.59501
0.0000
5
0.361679
0.005528
65.42805
0.0000
6
0.383372
0.005305
72.26311
0.0000
Endonezya
2
0.174423
0.005113
34.11328
0.0000
3
0.295257
0.008145
36.25186
0.0000
4
0.376986
0.009722
38.77690
0.0000
5
0.430999
0.010158
42.43078
0.0000
6
0.466780
0.009820
47.53367
0.0000
Rusya
2
0.185259
0.003233
57.29740
0.0000
3
0.311442
0.005123
60.79653
0.0000
4
0.396269
0.006079
65.18844
0.0000
5
0.451311
0.006312
71.49487
0.0000
6
0.486044
0.006064
80.14720
0.0000
Güney Afrika
2
0.170245
0.002770
61.46072
0.0000
3
0.285406
0.004385
65.08409
0.0000
4
0.361338
0.005199
69.50249
0.0000
5
0.409481
0.005394
75.92029
0.0000
6
0.438679
0.005176
84.74546
0.0000
Türkiye
2
0.173542
0.002475
70.11960
0.0000
3
0.289999
0.003920
73.97287
0.0000
4
0.368109
0.004650
79.16203
0.0000
5
0.418809
0.004826
86.77563
0.0000
6
0.450005
0.004634
97.10866
0.0000
895
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.

nin incelenmesi gerekmektedir. Bu durumda serilere
3
Tablo 3. 
Ülke
FWKSS Testi
WKSS Testi
FWKSS
Test
İstatistiği
FWKSS
Kritik Değerleri
Aydın (2019b, Tablo 2)
T
Test
İstatistiği

k
p
WKSS
Test
İstatistiği
p
%1
%5
%10
Arjantin (Durum 1)
-2.21**
-2.63
-2.05
-1.77
1.58
2
2
-1.87***
2
Brezilya (Durum 1)
-1.17
-2.48
-1.92
-1.64
1.35
5
1
-1.18
1

-0.79
-2.63
-2.05
-1.77
0.44
2
0
-0.74
1
Hindistan (Durum 1)
-0.07
-2.48
-1.92
-1.64
0.78
5
0
-0.05
0
Endonezya (Durum 1)
-1.09
-2.48
-1.92
-1.64
1.57
5
0
-1.03
0
Rusya (Durum 1)
-0.33
-2.48
-1.92
-1.64
2.37
5
0
-0.65
0

-1.61
-2.51
-1.96
-1.68
0.65
4
1
-1.66***
1

-0.42
-2.92
-2.29
-1.97
1.31
1
2
-0.73
2
 -2.40, -1.89 ve -- 

-2.69, -1.93, and -
 % 1,% 5 ve% 10'dak

de, 


              
    
    ,          


 niteliktedir. Wang ve Dunne (2003)

Inoue ve Hamori (2009), Soto (2003) ve Moore ve
Pen
,         da SAGP hipotezi
            Tablo 1

5. SONUÇ
,   
 
noktada
 
       , Arjantin ve
 ;  

 
           Burada
durumu, 
              Brezilya,
, 
896
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
             


     

            e

             


YAZARIN BEYANI
Katkı Oranı Beyanı: 
Destek ve Teşekkür Beyanı: 
Çatışma Beyanı: 
KAYNAKÇA
              
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Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
               
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ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
        - 1994:04)
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ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
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Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
               
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902
Süleyman Demirel Üniversitesi Vizyoner Dergisi, Yıl: 2021, Cilt: 12, Sayı: 31, 885-902.
ISSN: 1308-9552
Süleyman Demirel University Visionary Journal, Year: 2021, Volume: 12, No: 31, 885-902.
Ek 1.  
λ/d
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
Arjantin
0.997*
1.023*
1.015*
0.990*
1.019*
1.064*
1.046*
1.048*
1.032*
1.038*
1.032*
Brezilya
0.882*
0.780*
0.928*
0.941*
0.983*
1.075*
1.084*
1.135*
1.160*
1.224*
1.214*
Şili
0.605**
0.563**
0.662*
0.711*
0.894*
0.907*
0.978*
1.070*
1.115*
1.153*
1.180*
Hindistan
0.545**
0.933*
1.055*
1.116*
1.046*
0.943*
0.998*
0.944*
0.970*
1.006*
1.008*
Endonezya
0.639***
0.694**
0.833*
1.053*
1.054*
1.010*
1.009*
1.002*
1.006*
1.123*
1.104*
Rusya
0.682*
0.960*
0.922*
1.006*
0.979*
1.046*
1.095*
1.149*
1.199*
1.211*
1.232*
Güney Afrika
0.917*
1.035*
0.939*
0.831*
0.804*
0.892*
0.969*
0.931*
0.961*
0.981*
0.976*
Türkiye
0.855*
0.806*
0.764*
0.707*
0.726*
0.798*
0.843*
0.877*
1.012*
1.027*
1.064*
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Ek 2. Analizdeki Serilerin Grafikleri
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TURKIYE
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Article
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This study analyzes the long-run validity of purchasing power parity (PPP) in three types of market economies—developed, emerging, and frontier markets—using the Fourier quantile unit root test. The analyses are conducted on 45 countries, including 10 developed, 20 developing, and 15 frontier market economies, using monthly observations from 1993:1 to 2018:8. Conventional, nonlinear, and Fourier-type unit root tests are also employed for this purpose. The Fourier quantile unit root test results provide more evidence than other tests on the validity of PPP, showing that it is valid in 8 developed, 11 emerging, and 7 frontier market economies.
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This paper empirically investigates The Effects of monetary policy shocks on foreign exchange rates in Nigeria and South Africa using VAR procedures for the time series data which spanned the period 2005-2017. In order to achieve the objectives of the study, some selected components of monetary policy instruments and foreign exchange rates variables for Nigeria and South Africa were utilized. The results from the VAR method revealed that monetary policy shocks impacted on the variability for both countries' domestic exchange rates against the foreign currencies, nevertheless, these movements are inconsistent with theory. The empirical results further indicated that, especially for Nigeria, exchange rates movements are at variance with the expected outcome. Therefore, domestic currency depreciation is more likely to be experienced rather than appreciation in an economy where monetary policy contraction is embraced.
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Bu çalışmada Türkiye, Brezilya, Hindistan, Endonezya ve Güney Afrika ülkelerinde Satın Alma Gücü Paritesi hipotezi 1994:01-2018:11 arası dönem için sınanmıştır. Reel döviz kuru serilerinin doğrusal olmaması ve reel döviz kuru serilerinde ani ve/veya yumuşak kırılmalar bulunması nedeniyle serilerin durağanlığı doğrusal olmayan birim kök testleriyle sınanmıştır. Ranjbar vd. (2018) birim kök testine göre reel döviz kuru serileri Güney Afrika için trend dikkate alındığında simetrik yapı altında ve Hindistan için sabit dikkate alındığında asimetrik yapı altında durağandır. Dolayısıyla, analiz sonuçlarına göre, Güney Afrika ve Hindistan için Satın Alma Gücü hipotezinin geçerli olduğu yönünde bulgular elde edilmiştir. Diğer yandan Brezilya, Endonezya ve Türkiye için Satın Alma Gücü hipotezinin geçerli olmadığı sonucuna ulaşılmıştır.
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This paper examines the long‐run validity of purchasing power parity (PPP) for four high‐inflation countries. The method of Zivot and Andrews (1992) is employed to detect the time‐series behavior of the exchange rates and consumer price indices of these countries. We find that these variables are integrated with some trend breaks. We then utilize these data to test PPP using Johansen's (1988) multivariate cointegration technique. The cointegration tests are conducted with the correction of the finite sample bias and the adjustment for trend breaks. The results are consistent with the argument that, during the recent floating exchange‐rate period, PPP holds well, at least in a weak form, in high‐inflation countries where the general price level movement overshadows the factors causing deviations from PPP.
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Satın Alma Gücü Paritesi (SGP) teorisi, temelinde tek fiyat kanunun yer aldığı ve uzun dönemde reel döviz kurlarının sabit olduğu varsayımına dayanan bir yaklaşımdır. Özellikle Breton Woods sonrası dönemde döviz kurlarının dalgalanmaya bırakılması ile birçok iktisatçının SGP’nin geçerliliğini test etmeye yönelik çalışmalar yaptığı görülmektedir. Günümüzde ise ticaret savaşları ve korumacı politikalar nedeni ile başta gelişmekte olan ülkeler olmak üzere birçok ülkenin döviz kurlarında yaşanan yüksek volatiliteden kaynaklanan sorunlarla karşılaşması SGP yaklaşımının tekrar gündeme taşınmasına neden olmuştur. SGP yaklaşımının test edildiği çalışmalarda doğrusal ve doğrusal olmayan birim kök testlerinin kullanıldığı görülmektedir. Özellikle son yıllarda Fourier fonksiyonlarının kullanıldığı birim kök testlerinin daha yaygın şekilde kullanıldığı görülmektedir. Bu çalışmada Türkiye ekonomisi özelinde SGP’nin geçerli olup olmadığını reel döviz kuru (RDK) ve Reel efektif döviz kuru (REDK) veri setleri kullanılarak Fourier tipi birim kök testleri (FKPSS, FGLS ve FADF) ile analiz edilmiştir. Hem sabit formda hem de sabit-trend formda elde edilen sonuçlara göre analiz döneminde Türkiye Ekonomisi özelinde her üç birim kök testi sonuçlarına göre SGP’nin geçerli olmadığı sonucuna ulaşılmıştır.
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This study examines the long-run validity of purchasing power parity (PPP) through the Fourier quantile unit root test for a sample of ASEAN-5 countries. Using the aforementioned test, we can model structural breaks as a gradual and smooth process. The application of the conventional unit root tests provides conflicting results in support of the PPP hypothesis. However, the results of the Fourier quantile unit root test indicate that the real effective exchange rate series are stationary for Indonesia, the Philippines, Singapore, and Thailand.
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Non-stationary renewable energy consumption can be permanently affected by supply, demand and policy shocks, and in this case renewable energy promoting policies can be implemented effectively. It is therefore important to determine which type of renewable energy is stationary. To this end, we introduce a new wavelet-based unit root test which takes into account the smooth structural changes and frequency components in the series. With this method we investigate the stationary of the renewable energy consumption for the US over the period 1973m01-2019m09. To compare the results, we also use conventional ADF and wavelet-based ADF unit root tests that do not take into account structural breaks. The findings of the wavelet-based Fourier ADF unit root test indicate that biofuels energy consumption is stationary, while geothermal, waste, and wind energy consumption are non-stationary. Furthermore, the findings of the wavelet-based ADF unit root test indicate that while hydropower energy consumption is stationary at levels, solar, wood, total biomass, and total renewable energy consumption contain a unit root. Overall, we conclude that renewable energy policies implemented in the US have permanent effects on seven types of renewable energy consumption, whereas these policies have temporary effects on hydropower and biofuels energy consumption.
Article
Satın alma gücü paritesi, iki ülke arasındaki fiyat düzeyi farklılıklarını ortadan kaldırmakta ve bu ülkelerdeki fiyat düzeylerinin aynı para birimiyle ifade edilebileceğini ifade etmektedir. Bu bağlamda satın alma gücü paritesi hipotezi çerçevesinde, reel döviz kurlarının uzun dönemde durağan olup olmadığının belirlenmesi ekonomi politikası açısından önem kazanmaktadır. Bu çalışmada Türkiye için satın alma gücü paritesi 1994:1-2019:1 dönemi aylık verileriyle test edilmektedir. Analiz hem geleneksel hem de kırılmalı birim kök testleri kullanılarak yapılmaktadır. Geleneksel birim kök test sonuçlarına göre, Türkiye'de ilgili dönemde satın alma gücü paritesi hipotezinin geçerli olmadığı, ancak yapısal kırılmalı birim kök test sonuçlarına göre, hipotezin geçerli olduğu bulgusu elde edilmiştir.
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This paper aims to investigate the sources of real exchange rate fluctuation by utilizing sign restrictions in structural vector autoregressive (SVAR) method. Under an agnostic identification scheme, the empirical results show that the delayed overshooting puzzle still exists in response to monetary shock even if price puzzle is ruled out by construction. In contrast, all countries experience a significant initial real depreciation, and then gradually appreciate in response to currency risk premium (CRP) shock. This finding is consistent with Dornbusch’s overshooting model. In addition, I examine the importance of investors’ expectations in determining the short-term variations in the real exchange rate. The results indicate that the CRP and expectation shocks obviously outperformed the demand, supply and monetary shocks in terms of explaining the real exchange rate fluctuation.