Junichiro Wada

Junichiro Wada
Yokohama City University | YCU · Department of Economics

PhD

About

17
Publications
493
Reads
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76
Citations
Citations since 2017
3 Research Items
19 Citations
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Introduction
Junichiro Wada currently works at the Department of Economics, Yokohama City University. Junichiro does research in Public Economics, Elections, Public Opinion and Voting Behavior and Political Economy. Their most recent publication is 'Studying malapportionment using α -divergence'.

Publications

Publications (17)
Article
Existing studies on legislative malapportionment often conceptualize and measure this phenomenon with little regard to intertemporal variations and the malapportionment-generating process (MGP). Our conceptualization leads us to introduce a measure called α-divergence that can identify the vote inequality derived from various stages of MGP. Using a...
Article
This study shows the superiority of α-divergence over Samuels and Snyder's MAL index for 73 countries, using Samuels and Snyder's database. As α-divergence rests on a philosophical basis, that is, a microfoundation, we calculate the degree of malapportionment in terms of each philosophy of apportionment and/or presume the apportionment principles o...
Article
Apportionment of representatives is a basic rule of everyday politics. By definition, this basic rule is a constitutional stage problem and should be decided behind the veil of uncertainty. To bring apportionment closer to quotas, we introduce f-divergence for utilitarianism and Bregman divergence for consistent optimization. Even in our less restr...
Article
To bring apportionment closer to quotas or the apportionment quotient closer to the population quotient, instead of using “distance,” we introduce f-divergence for utilitarianism and Bregman divergence for suitable optimization. Even in our relaxed condition, we find that we must use alpha-divergence for optimization and show that the minimization...
Article
This paper links Stolarsky mean apportionment methods, which include the US House of Representatives, the Saint-Lague, and the d’Hondt methods, to Kolm–Atkinson social welfare maximization and to generalized entropy minimization. Within this class, the logarithmic mean apportionment method is the most unbiased one that assigns at least one sea...
Article
Full-text available
Using the Nash product (Nash Social Welfare Function) as a micro foundation, we create a decomposable index to evaluate the unfairness of representation in electoral districts. Using this index, we decompose the factors of such unfairness into apportionment and districting. We explore the situations of New Zealand, the United States, Australia, the...
Chapter
After the Recruit scandal in 1988, there was a six-year political drama about electoral reform in Japan. In 1993, the Liberal Democratic Party (LDP) lost its power for the first time since its foundation in 1955. The new election rule was decided during that time. But the new mixed system is considered better for the LDP than previous systems with...
Article
This is a unique analysis of the present Japanese political system which will interest both political economists and non-specialists alike. For the first time approaches used to analyse American and European political systems are applied to 'mysterious' Japan.
Article
Full-text available
With the recent election reform, the Japanese Diet did not correct the unequal apportionment enough. The Lower House slipped in a rule that is advantageous for less populated prefectures. They provided one seat for each prefecture at first and after that the rest of the seats are assigned by the rule of the method of largest remainders. Because of...
Chapter
Since its establishment in 1955 and until August 1993, the Liberal Democratic Party (LDP) was the ruling party in the Japanese government.2 However, there is a consensus among researchers that the LDP was not a single party in this period, but a coalition of different factions.3 Indeed each faction in the LDP has its own office, its own account sys...
Article
Full-text available
In the context of “Shou-senkyoku=Hirei-daihyou=Heiritsu-sei, “Duverger's Law” will be studied using a game theoretical model. The main result is two theorems. The Negative Theorem is that exit from an election, which means implicit alliance, occurs only if the Condorcet winner is not the biggest party. The Positive Theorem is that except for the ca...
Article
Thesis (Ph. D.)--University of Maryland at College Park, 1995. Includes bibliographical references (leaves 177-192). Microfiche.

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