Bias in an Empirical Approach to Determining Bond and Mortgage Risk Premiums

Paul D Childs, Steven H Ott and Timothy J Riddiough

The Journal of Real Estate Finance and Economics, 1997, vol. 14, issue 3, 263-82

Abstract: Empirical studies of bond and commercial mortgage performance often quantify a required risk premium by examining the difference between the promised yield and the realized yield as adjusted for default occurrence. These studies omit the effect of various other sources of risk, however, including collateral asset market risk, interest rate risk, and possibly call risk. These omissions downwardly bias the empirical risk premium estimate on the debt. In this paper, we disentangle and quantify the sources of this bias by modeling secured coupon debt (the commercial mortgage) as used in the calculation of a realized investment return. We consider deterministic and stochastic interest rate economies with mortgage contracts that are either noncallable or subject to a temporary prepayment lockout period. Given realistic parameter values associated with the term structure, underlying asset dynamics, and debt contracting, we show that the magnitude of the bias can be significant. Copyright 1997 by Kluwer Academic Publishers

Date: 1997
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