... 11 The expected influence is not clear for authors. In an early study, Chang et al. (2009) observe a threshold effect regarding the pace of economic 10 Other determinants considered by few authors include: population characteristics (human capital, poverty, female or working-age population ratios) (Pfeiffer and Mulder, 2013;Romano et al., 2017;Zhao et al., 2013;Apergis and Eleftheriou, 2015;Ackah and Kizys, 2015;Zeb et al., 2014), official development assistance and clean development mechanism (Brunnschweiler, 2010;Pfeiffer and Mulder, 2013;Baldwin et al., 2017;Carley, 2009), physical potential of RE sources in general (Marques et al., 2010(Marques et al., , 2011Best, 2017;Bayulgen and Ladewig, 2017) or specific to some RE technologies (Aguirre and Ibikunle, 2014), political system related variables (Cadoret and Padovano, 2016;Cheon and Urpelainen, 2013;Apergis and Eleftheriou, 2015), EU membership (Marques et al., 2010(Marques et al., , 2011Biresselioglu and Karaibrahimoglu, 2012;Cheon and Urpelainen, 2013), knowledge accumulation related to RE patents (Popp et al., 2011;Geng and Ji, 2016;Cheon and Urpelainen, 2013), capital accumulation or flow (Lin and Omoju, 2017;Ackah and Kizys, 2015), fossil fuel rents Carley et al., 2017;Lin and Omoju, 2017;Bayulgen and Ladewig, 2017), resources depletion (Ackah and Kizys, 2015;Zeb et al., 2014), energy or electricity mix concentration (Valdés Lucas et al., 2016;Pfeiffer and Mulder, 2013), power sector reforms (Brunnschweiler, 2010;Aguirre and Ibikunle, 2014), industrial or energy-intensive sector size (Cadoret and Padovano, 2016;Nyiwul, 2017;Cheon and Urpelainen, 2013), previous commitment to RE (Marques et al., 2010;Marques and Fuinhas, 2012;Aguirre and Ibikunle, 2014;Cheon and Urpelainen, 2013). 11 Only Aguirre and Ibikunle (2014) have both fossil fuel prices and electricity price in their model. ...