Divergent Platforms

Publication Type  Preprints
Author  Sophie Bade
Year of Publication  2011
Issue  2011/25
Abstract  A robust feature of models of electoral competition between two opportunistic, purely office-motivated parties is that both parties become indistinguishable in equilibrium. I this short note, I show that this strong connection between the office motivation of parties and their equilibrium choice of identical platforms depends on the following two - possibly counterfactual - assumptions: 1. Issue spaces are uni-dimensional and 2. Parties are unitary actors whose preferences can be represented by expected utility functions. The main goal here is to provide an example of a two-party model in which parties offer substantially different platforms in equilibrium even though no exogenous asymmetries are assumed. In this example, some voters’ preferences over the 2-dimensional issue space are assumed to exhibit non-convexities and parties evaluate their actions with respect to a set of beliefs on the electorate.
Publisher  Max Planck Institute for Research on Collective Goods
Place Published  Bonn
URL  http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1946736
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Keywords  Downs model, Games with Incomplete Preferences, Knightian Uncertainty, Uncertainty Aversion., Platform Divergence
JEL-Codes  D81, D72, C79