Mainstream comparative research on political institutions focuses
primarily on formal rules. Yet in many contexts, informal institutions,
ranging from bureaucratic and legislative norms to clientelism and
patrimonialism, shape even more strongly political behavior and
outcomes. Scholars who fail to consider these informal rules of the
game risk missing many of the most important incentives and constraints
that underlie political behavior. In this article we develop a
framework for studying informal institutions and integrating them into
comparative institutional analysis. The framework is based on a
typology of four patterns of formal-informal institutional interaction:
complementary, accommodating, competing, and substitutive. We then
explore two issues largely ignored in the literature on this subject:
the reasons and mechanisms behind the emergence of informal
institutions, and the nature of their stability and change. Finally, we
consider challenges in research on informal institutions, including
issues of identification, measurement, and comparison.Gretchen Helmke's book Courts Under
Constraints: Judges, Generals, and Presidents in Argentina, will
be published by Cambridge University Press. Steven Levitsky is the
author of Transforming Labor-Based Parties in Latin America:
Argentine Peronism in Comparative Perspective and is currently
writing a book on competitive authoritarian regimes in the
post–Cold War era. The authors thank the Weatherhead Center for
International Affairs at Harvard University and the Kellogg Institute
for International Studies at the University of Notre Dame for
generously sponsoring conferences on informal institutions. The authors
also gratefully acknowledge comments from Jorge Domínguez, Anna
Grzymala-Busse, Dennis Galvan, Goran Hyden, Jack Knight, Lisa Martin,
Hillel Soifer, Benjamin Smith, Susan Stokes, María Victoria
Murillo, and Kurt Weyland, as well as three anonymous reviewers and the
editors of Perspectives on Politics.