Bicameralism and Party Politics in Germany: An Empirical Social Choice Analysis

Abstract

This paper analyses whether and how party politics transform German bicameralism. Based on the policy positions of bicameral legislators, the study computes the win sets, the yolks of each chamber and a Nash solution in order to analyse empirically the effects of party politics on German bicameralism. In comparison to the basic bicameral model, hypotheses on bicameral conflict and policy stability are tested in the case of similar and different party majorities in the two-dimensional policy space of German labour politics. The results show that party politics transform German bicameralism in two ways. Similar majorities collapse bicameral checks-and-balances, while different party majorities come close to the basic bicameral model with high policy stability and conflict between both chambers.

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