Standard Bayesian models assume agents know and fully exploit prior distributions over types. We are interested in modeling agents who lack detailed knowledge of prior distributions. In auctions, that agents know priors has two consequences: (i) signals about own valuation come with precise...

The social engineering ambitions of economics have never been so high. Economists are increasingly invited to construct markets from scratch or to design mechanisms that mimic the market. Science students take these social engineering efforts as evidence for the capacity of economists to make...