We propose a simple model of racial bias in hiring that encompasses three major theories: taste-based discrimination, screening discrimination, and complementary production. We derive a test that can distinguish these theories using the mean and variance of workers' productivity under managers...

We study multi-object auctions where agents have private and additive valuations for heterogeneous objects. We focus on the revenue properties of a class of dominant strategy mechanisms where a weight is assigned to each partition of objects. The weights influence the probability with which...

We show that a mechanism that robustly implements optimal outcomes in a one-dimensional supermodular environment continues to robustly implement ε-optimal outcomes in all close-by environments. Robust implementation of ε-optimal outcomes is thus robust to small perturbations of the...

This paper analyses a model of R&D where the product quality is imperfectly observed by customers. We consider different types of customer monitoring and characterise the equilibrium levels of investment and the resulting reputational dynamics.

If the firm does not know its own quality, we show that the firm stops investing when its reputation gets close to the exit threshold and its life-expectancy vanishes. If the firm knows its own quality, to the contrary, we show that the firm optimally invests until its reputation falls to the...

We introduce a model of strategic experimentation on social networks where forwardlooking agents learn from their own and neighbors’ successes. In equilibrium, private discovery is followed by social diffusion. Social learning crowds out own experimentation, so total information decreases with...

In a range of settings, private firms manage peer effects by sorting agents into different groups, be they schools, communities, or product categories. This paper considers such a firm, which controls group entry by setting a series of anonymous prices. We show that private provision...