Market discipline, bank subordinated debt, and interest rate uncertainty
In a recent critique of the ‘market discipline’ literature in banking, Gorton and Santomero [ Journal of Money, Credit and Banking 22 (1990) 119–128] emphasize the need for adopting a rigorous valuation model in order to test for the existence of market discipline. They employ a standard version of the contingent claims pricing model in which firm-value risk is the only source of uncertainty. In this paper we extend their model by also incorporating interest rate uncertainty. The results reported here demonstrate the complex interaction effects arising from the joint uncertainties of firm risk and interest rate risk. No simple monotonie relationship exists with respect to interest rate uncertainty. The analysis presented in this paper is also applicable to a much wider class of debt-valuation problems and is not restricted to a specific question of banking policy.