By modeling the market for IPOs as a repeated game with imperfect monitoring, we establish that collusion among underwriters explains the concentration of spreads at 7%, along with other characters of the data on spreads. Furthermore, the structure of optimal spreads in the model explains the...

We study the impact of model disagreement on the dynamics of asset prices, return volatility, and trade in the market. In our continuous-time framework, two investors have homogeneous preferences and equal access to information, but disagree about the length of the business cycle. We show that...