Optimal ROE loan pricing with or without adverse selection

B V Oliver and R M Oliver
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B V Oliver: Sandia Corporation, Albuquerque, USA
R M Oliver: University of California, Berkeley, USA

Journal of the Operational Research Society, 2014, vol. 65, issue 3, 435-442

Abstract: The authors describe the structural solution of the loan rate as a function of default and response risk that maximizes expected return on equity for a lender's portfolio of risky loans. Under the assumptions of our model, the non-linear differential equation for the optimizing price is found to be separable in transformed financial, response and risk variables. With an end-point condition where default-free borrowers are willing to borrow at loan rates higher than the lender's cost of funds, general solutions are obtained for cases where default probabilities may depend explicitly on the offered loan rate and where adverse selection may or may not be present. For the general solution, we suggest a numerical algorithm that involves the sequential solutions of two separate transcendental equations each one of which depends on parameters of the risk and response scores. For the special case where the borrower's default probability is conditionally independent of loan rate, it is shown that the optimal solution is independent of Basel regulations on equity capital.

Date: 2014
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