Assessing Systemic Risk Exposure from Banks and GSEs Under Alternative Approaches to Capital Regulation
Paul Kupiec () and
David Nickerson ()
The Journal of Real Estate Finance and Economics, 2004, vol. 28, issue 2_3, 123-145
A key function of capital regulation is to mitigate the potential for systemic financial risk by maintaining public confidence in the ability of regulated market participants to honor their financial obligations in times of market stress. While it is well known that the portfolios of banks and non-banks, especially those intermediaries specializing in mortgage securitization or in specialized mortgage lending, differ in important respects, debate over alternative capital regulations has yet to recognize the implications of these differences, despite the increasing importance of non-bank intermediaries in risk-sharing markets. This paper uses a simple two-date discrete state space exchange economy with opportunities for moral hazard on the part of financial intermediaries to investigate the design of capital regulations to control systemic risk. Holding constant asset risks, we show that intermediaries that issue contingent liabilities may exhibit low or no risk of insolvency while holding significantly less capital than deposit-taking institutions because banks primarily issue claims that promise fixed payments in all states of nature. We also show that, rather than raising capital requirements, the control of systemic risk may involve lowering capital requirements and extending guarantees to liability-holders, without a necessary increase in expected subsidy payments, if such requirements account for shareholder incentives. Specifically, we analyze an example of regulatory policy in which lower capital requirements and an ex post penalty schedule reduce systemic risk by increasing the volume of tradable securities exchanged and by offering a credible mechanism by which intermediaries can signal the true riskiness of their portfolios to liability-holders.
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