I consider whether government prizes should replace market prices for inventions. The America COMPETES Reauthorization Act of 2010 establishes a framework for government prizes. I examine how the economic benefits of the market for inventions should antitrust and public policy towards patents. I consider the limitations of a prize system in terms of economic efficiency. I find that the deadweight welfare loss argument for replacing market prices with government prizes is flawed. I show how prices in the market for inventions provide state-contingent signals that guide invention, commercialization, innovation, financing, and complementary inventions. I examine how prices in the market for inventions provide indicators of technological change. I conclude that replacing market prices with government prizes would harm invention, innovation and economic growth.