The paper studies a federal system where (a) a region provides non-contractible inputs into the social benefits from a public policy project with spillovers to other regions, and (b) where political bargaining between different levels of government may ensure efficient decision making ex post....

The paper considers a two-tier institution in which government provides public services, but individuals can opt out of public provision (but not taxes). Funding for the public service is chosen endogenously by majority vote, and we first provide necessary and sufficient conditions for a...