Prizes versus Contracts as Incentives for InnovationWe would like to thank Roberto Burguet, Estelle Cantillon, Pierre-André Chiappori, Daniel Danau, Francesco Decarolis, Drew Fudenberg, Bruno Jullien, Laurent Lamy, Patrick Legros, Oliver Hart, Giancarlo Spagnolo, Yossi Spiegel, Jean Tirole and part