Abstract: Unified government exists when a single party has a majority in the Assembly and forms the Cabinet in a parliamentary regime, or when the party of the popularly elected executive President has a majority in the Assembly in a presidential or semi-presidential regime. Congruence or cooperation between the executive and the legislative tend to produce more socially satisfactory policy outcomes.

Keywords: divided government, federalism, parliamentarism, political parties, presidentialism, social utility, unified government,