Abstract
This article explains variations in levels of institutionalization across legislatures of the world. It construes institutionalization as an equilibrium outcome that emerges from beliefs and investments made by political actors. Drawing insights from work on US congressional institutionalization and congressional organization, and on comparative party system institutionalization, it provides an index to measure congressional institutionalization. Using this index, it explores the constitutional factors that affect levels of congressional institutionalization. The empirical results raise a warning with respect to building comparative implications from an excessive focus on one particular case.
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