After the financial crisis, a focus on safety and soundness was good medicine for the financial system. New bank liquidity and capital policies, among other initiatives, strengthened a debilitated patient. The banking system is now stronger, with more liquid assets and better underwriting standards.

Despite good intentions, however, politicians and regulators constructed an expansive and untested regulatory framework that will have unintended consequences for liquidity in our financial system. Taken together, these regulatory changes may well fuel the next financial crisis as well as slow US economic growth.