constitute the most common form of local government in the United States today. Collectively, special purpose governments have more civilian employees than the federal government and spend more than all city governments combined. The proliferation of special purpose jurisdictions has fundamentally altered the nature of representation and taxation in local government. Citizens today are commonly represented by dozens - in some cases hundreds - of local officials in multiple layers of government. As a result, political participation in local elections is low and special interest groups associated with each function exert disproportionate influence. With multiple special-interest governments tapping the same tax base, the local tax base takes on the character of a common-pool resource, leading to familiar problems of overexploitation. Strong political parties can often mitigate the common-pool problem by informally coordinating the policies of multiple overlapping governments.

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