It is tempting to view the financial downturn as a closed chapter whose primary causes have been resolved—perhaps not perfectly, but fairly comprehensively—by the Dodd-Frank Act’s reregulation of the financial services industry. But big banks continue to have a governance problem, which poses significant risks not just to them but potentially to the entire economy during the next downturn.

A version of this article appeared in the June 2012 issue of Harvard Business Review.