We use firm's endogenous contractual response to help implement the constrained first best through a simple yet powerful progressive labor income tax system. In our model, workers privately experience both a persistent ability shock and many transient productivity shocks during their life...

This paper shows the existence of monotone pure-strategy equilibrium in auctions with both common-value bidders and private-value ones. In equilibrium, the common-value bidders bid less aggressively when there are more private-value bidders. Further, resale is discussed as an application.

We examine how buyers’ behaviors, sellers’ profits and the social welfare (the total surplus of all sellers and buyers) vary with the order of sellers in sequential auctions where sellers have different reservation values. First, when reserve prices are exogenously set to be sellers’...