We study an incentive auction in which multiple principals bid for the exclusive services, or effort, of a single agent. Each principal has private information about her valuation for these services, and the agent has private information about his disutility of providing them. We characterize...

I analyze a common agency relationship where the agent has private information about the difference in his value for two principals. When the principals independently offer incentive contracts, the agent specializes less than is socially efficient, but more than when they cooperate and choose...