Effectivity functions and stable governance structures (Q1614132)

The author studies the existence of `stable' outcomes in governance structures in multiparty systems by means of a coalitional game-theoretic model in effectivity-function form. The used solution concept is a refined version of the core related to its von Neumann-Morgenstern-stability properties. It is shown that, if the outcome of the electoral process includes a fixed minimal majority coalition, then the outcome-stability follows in multiparty environments. If the outcome allows formation of several alternative minimal majority coalitions, then the outcome-instability cannot be ruled out by other institutional means.