There has long been debate on the extent to which the structure of government in metropolitan areas helps or hinders income growth. Polycentrists contend that numerous local governments lead to competition that streamlines government, produces services at least cost, and leads to higher incomes. Centrists argue that large, multiple service governments have scale economies leading to more efficient production of services and hence higher incomes. What matters to regionalists is whether there is a metropolitan governance arrangement that effects an improvement in the distribution of economic activity that increases income. Which school of thought is right? This article evaluates the association between metropolitan governance structures and growth in per capita personal income among Ͻ287 of the largest metropolitan statistical areas for the period 1976 to 1996. After controlling for several factors, we find empirical support for the centrist and regionalist schools of thought but very little support for the polycentrist school.A growing literature addresses the link between the structure of governance at the metropolitan level and income growth (Foster, 1993;Nelson, 1990;Ward, 1987). This literature is advanced by "polycentrists," "centrists," and more recently "regionalists" (for a review, see Wallis, 1996).Polycentrists argue that fragmented structures offer greater choice among service and tax/fee bundles for residents and firms with diverse preferences, constrain the costs of local government through competition, elevate overall government performance through experimentation by many units of governments at different levels, and increase the level of political representation and participation by individuals. Centrists counter that consolidated structures are more desirable because they capture efficiencies in economies of scale and agglomeration of talent, internalize externalities, promote fiscal equity, facilitate more efficient coordination of land use and facility planning, and economize on the potentially costly concessions common to many well-publicized competitions for "marquee" firms. In recent years, a third school of thought, espoused by regionalists, has downplayed traditional concerns about the actual arrangement of municipal governments to focus instead on the existence of regionwide mechanisms for collaborative decision making.The persistence and intensity of the debate stem from its policy relevance. As regions respond to the imperatives of global competition, public officials, policy analysts, and citizens seek to know