This paper characterizes all outcomes supportable by implicit employment contracts of the most general form when employee's performance is not public information. A strictly positive economic surplus must result from employment, the form of contract depending on how this surplus is divided...

Workers will not pay for general on-the-job training if contracts are not enforceable. Firms may if there are mobility frictions. Private information about worker productivities, however, prevents workers who quit receiving their marginal products elsewhere. Their new employers then receive...

Suppliers who are better informed than purchasers, such as physicians treating insured patients, often have discretion over what to provide. I show how, when the purchaser observes what is supplied but neither the recipient type nor the actual cost incurred, optimal provision differs from what...

This paper reviews a recent literature that extends the Rubinstein/Stahl bargaining model to the case of contract bargaining. Theoretical issues, such as the appropriate game form, existence, and uniqueness of equilibria, are discussed. The paper finishes with a brief overview of some...