Dysfunctional Finance: Positive Shocks and Negative Outcomes

In financial markets with asymmetric information about mean returns, borrowers with different default risks may pay the same rate of interest. If they do, the marginal borrower will have a high-risk, negative-value project. Under some conditions, technological change that increases each entrepreneurs output will attract a new set of negative-value projects. This adverse selection process will erode the ability rents of the inframarginal borrowers. I present an example in which it destroys the market. The results imply that a boom in a sector can lead to a crisis if institutional change to solve the screening problem does not occur.