Why 'Basel II' may need a leverage ratio restriction
We analyze regulatory capital requirements where the amount of required capital depends on the level of risk reported by the banks. It is shown that if the supervisors have a limited ability to identify or to sanction dishonest banks, an additional, risk-independent leverage ratio restriction may be necessary to induce truthful risk reporting. The leverage ratio helps to offset the banks' potential capital savings of understating their risks by (i) reducing banks' put option value of limited liability ex ante, and by (ii) increasing the banks' net worth, which in turn enhances the supervisors' ability to sanction banks ex post.
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