Atlantic Economic Journal

, Volume 15, Issue 2, pp 33–41 | Cite as

Why are mortgage rates so uniform?

  • Eva Marikova Leeds


Any reasonable model of mortgage lending concludes that interest rates depend on loan and borrower characteristics. In this paper, the rate is a function of the loan-to-value ratio, the parameters of the densities of future price of housing and income, deposit rate, and cost of foreclosure.

Nevertheless, in practice, each lender charges only one rate to all borrowers. This is first explained by the difficulty of estimation of the parameters of the density functions. Since lenders cannot categorize their borrowers, they treat them uniformly and set minimum standards to minimize the risk of default by each borrower. Mortgage insurance, moreover, enables lenders to lend risklessly outside of the range in which they can operate risklessly on their own.

Second, mortgage rate uniformity is explained by the lenders' risk aversion.

Third, when borrowers are separated into discrete categories, uniform rates can result from perfect categorization of borrowers with respect to the future value of the relevant random variables. It is more likely, however, that lenders cannot categorize borrowers perfectly and that interest rates vary substantially among categories. As rates jump from one category to the next and borrowers are reluctant to gain small increases in loan size at significantly higher rates, lenders respond by offering only the basic category of loans.


Density Function Interest Rate Deposit Rate Risk Aversion International Economic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Ernst Baltensperger, “The Borrower-Lender Relationship, Competitive Equilibrium, and the Theory of Hedonic Prices,”The American Economic Review, 66, June 1976.Google Scholar
  2. Robert Barro, “The Loan Market Collateral, and Rates of Interest,”Journal of Money, Credit, and Banking, 8, November 1976.Google Scholar
  3. Marshall Freimer and Myron Gordon, “Why Bankers Ration Credit,”Quarterly Journal of Economics, 79, August 1965.Google Scholar
  4. Jerry Jackson and David Kaseman, “Default Risk on Home Mortgage Loans: A Test of Competing Hypothesis,”Journal of Risk and Insurance, December 1980.Google Scholar
  5. Avner Kalay and Ramon Rabinovitch, “On Individual Loans' Pricing Credit Rationing and Interest Rate Regulation,”The Journal of Finance, 33, September 1978.Google Scholar
  6. Mortgage Reporting Service Inc., “Complete Mortgage Rates and Programs for the Greater Delaware Valley Area,” May 10, 1985.Google Scholar
  7. Clifford Smith, “On the Theory of Financial Contracting,”Journal of Monetary Economics, 6, 1980.Google Scholar
  8. Vernon Smith, “The Borrower-Lender Relationship,”The American Economic Review, 66, June 1976.Google Scholar
  9. George von Fürstenberg, “Default Risk on FHA-Insured Home Mortgages as a Function of the Terms of Financing: A Quantitative Analysis,”Journal of Finance, 24, June 1969.Google Scholar
  10. Stephen Zabrenski, “New Measures of Mortgage Rates and Lending Policies,”Federal Home Loan Bank Board Journal, June 1978.Google Scholar

Copyright information

© Atlantic Economic Society 1987

Authors and Affiliations

  • Eva Marikova Leeds
    • 1
  1. 1.Franklin and Marshall CollegeUSA

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