Institutions. Transaction Cost Politics in the Map of the New Institutionalism / Gonzalo Caballero, Xosé Carlos Arias -- Political Transitions in Ancient Greece and Medieval Italy: An Analytic Narrative / Leandro De Magalhães -- A Collective-Action Theory of Fiscal-Military State Building / Luz Marina Arias -- Stable Constitutions in Political Transition / Katja Michalak, Gerald Pech -- Quandaries of Gridlock and Leadership in US Electoral Politics / Evan Schnidman, Norman Schofield -- Sub-central Governments and Debt Crisis in Spain over the Period 2000-2011 / Fernando Toboso -- Deciding How to Choose the Healthcare System / Olga Shvetsova, Katri K. Sieberg -- Modelling. Challenges to the Standard Euclidean Spatial Model / Jon X. Eguia -- A Non-existence Theorem for Clientelism in Spatial Models / Daniel Kselman -- Nonseparable Preferences and Issue Packaging in Elections / Dean Lacy, Emerson M.S. Niou -- When Will Incumbents Avoid a Primary Challenge? Aggregation of Partial Information About Candidates' Valence / Gilles Serra -- Measuring the Latent Quality of Precedent: Scoring Vertices in a Network / John W. Patty, Elizabeth Maggie Penn, Keith E. Schnakenberg -- Empirical Analysis. The Politics of Austerity: Modeling British Attitudes Towards Public Spending Cuts / Harold D. Clarke [and others] -- Modeling Elections with Varying Party Bundles: Applications to the 2004 Canadian Election / Kevin McAlister, Jee Seon Jeon, Norman Schofield -- Spatial Model of Elections in Turkey: Tracing Changes in the Party System in the 2000s / Norman Schofield, Betul Demirkaya -- Do Competitive Districts Necessarily Produce Centrist Politicians? / James Adams [and others] -- A Heteroscedastic Spatial Model of the Vote: A Model with Application to the United States / Ernesto Calvo, Timothy Hellwig, Kiyoung Chang --