Variable capital rules in a risky world

The recent financial crisis showed that a financial institution's equity may be sufficient to absorb losses during normal times, but insufficient during periods of systemic distress. In recognition of this risk, the Basel III agreement last year introduced a new element of macroprudential regulation called countercyclical buffers, variable capital requirements that shift based on credit growth. These buffers raise the classic regulatory dilemma of safety versus economic growth, but may provide protection against financial calamity at an acceptable cost.