Financial Sophistication and Bank Market Power

We study the relation between bank funding costs and the financial sophistication of bank customers. In doing this, we make use of a natural experiment that allows us to identify banks that—either intentionally or unintentionally—price time deposits in a way that can result in financially-unsophisticated customers essentially being shortchanged. We find that these banks have significantly lower deposit funding costs. These results provide evidence that having financially-unsophisticated customers may provide banks with substantial market power and be an important component of the value of a bank's deposit franchise.