In this paper we show that in a simple spatial model where the government is chosen under strict proportional rule, if the outcome function is a linear combination of parties' positions, with coefficient equal to their share of votes, essentially only a two-party equilibrium exists. The two...

Representations of constitutions -- to Part I -- Constitutions, effectivity functions, and game forms -- Nash consistent representations -- Acceptable representations -- Strongly consistent representations -- Nash consistent representation through lottery models -- On the continuity of...