Abstract: Capital requirements are a key element in containing systemic risk. This article argues that the market needs to play a more significant role in determining these requirements. The Basel process has a bad track record and there are inherent methodological and political difficulties in a group of regulators, particularly an international one, determining the appropriate amount of capital for a given risk. An added role for the market depends, however, on fuller disclosure by banks of their risks and minimization of the moral hazard created by bailouts, so creditors and counterparties bear a fuller measure of the risk.