The Dodd-Frank Act, enacted after the global financial crisis, requires U.S. financial regulators to define and regulate systemically risky firms and activities — a truly Sisyphean task. In this Essay, we identify two paths regulators have taken: a “descriptive approach,” which involves...

In the recent financial crisis, risk management tools have been proven inadequate. Model risk, a key component of bank risk, has shown its negative impact. It seems that risk models did not cover the included risks comprehensively and were not kept up-to-date by banks, and also rating agencies....