Bank capital standards for foreign exchange and other market risks
AbstractThe Basle Committee on Banking Supervision has proposed methods for incorporating consideration of market risks--exchange rate, interest rate, and equity price risks--into risk-based capital standards for banks. This paper shows that the separate and seemingly different proposed approaches to the three sources of risk are consistent with one another, reflecting a single unifying theme. That theme is the measurement of risk through a weighting of two different measures of portfolio size, the gross position and the net position. A simple theoretical model demonstrates that such an approach can be viewed as a simple (specifically, an affine) approximation to a portfolio variance calculation based on the full variance-covariance matrix of market returns, and thus provides a reasonable basis for a practical approach to capital standards. An empirical test of one part of the framework, the proposal for exchange rate risk, shows that the approximation may be very accurate: the proposed Basle approach captures over 95 percent of the variation in foreign exchange risk across a sample of banks from the Twelfth Federal Reserve District.
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Bibliographic InfoArticle provided by Federal Reserve Bank of San Francisco in its journal Economic Review.
Volume (Year): (1994)
Issue (Month): ()
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- Sandra L. Chamberlain & John S. Howe & Helen Popper, 1996. "The Exchange Rate Exposure of U.S. and Japanese Banking Institutions," Center for Financial Institutions Working Papers 96-55, Wharton School Center for Financial Institutions, University of Pennsylvania.
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