The historical institutionalist tradition in comparative politics commonly assigns analytical primacy to political institutions. Whereas this polity-centeredness may be quite justifiable for purposes of comparative public policy, students of comparative political economy should pay systematic attention not only to economic institutions but also to a range of economic-structural variables that lie beyond the conventional confines of institutional analysis. Providing the basis for an analysis of collective actors and their interests, such an approach is needed to account for institutional change and policy realignments within stable institutions.