Understanding the formation of governments has always been central to political science. Traditionally this topic has been considered from a rational choice theory perspective and the empirical testing of these theories; however neither approach alone is able to explain a large proportion of actual coalition formations. This comparative volume brings together a rational choice theory perspective and the empirical testing of these theories to study government formation. It provides in-depth studies of government formations in Europe that cannot be accounted for by existing coalition theory in order to identify potential explanatory factors that have been neglected so far. These ‘coalition puzzles’ are reconstructed by country experts based on secondary sources, newspaper accounts, internal party documents, and interviews in an effort to understand why particular governments were formed. In conclusion, this book assesses whether new factors can be integrated into rational choice theories or whether these analyses point to the need for a different paradigm. This important volume will be of interest to students and scholars of political science, European politics and comparative politics.

In this paper we present a structural approach to the study of government formation in multi-party parliamentary democracies. The approach is based on the estimation of a stochastic bargaining model which we use to investigate the effects of specific institutional features of parliamentary democracy on the formation and stability of coalition governments. We then apply our methodology to estimate the effects of governmental bicameralism. Our main findings are that eliminating bicameralism does not affect government durability, but does have a significant effect on the composition of governments leading to smaller oalitions. These results are due to an equilibrium replacement effect: removing bicameralism affects the relative durability of coalitions of different sizes which in turn induces changes in the coalitions that are chosen in equilibrium.

This article proposes a method to estimate relative ministerial weights in parliamentary democracies. Specifically, we present a bargaining model of government formation and estimate structural parameters of the model using data for (i) who the formateurs are, (ii) what each party's voting weight is, and (iii) what ministerial seats each party obtains. We also measure the effects of voting weights and formateur advantage on bargaining results. We apply our proposed method to the case of Japan. Our estimation results show that political players value pork-related posts (such as the Minister of Construction) much more than prestigious ones (such as the Minister of Foreign Affairs). We also find that there is a significant formateur advantage, whereas voting weights do not have a significant scale effect, which is consistent with the findings for European democracies.