INTEREST RATES, EXPECTATIONS, AND MARGINAL TAX RATES: THE DARBY—FELDSTEIN EFFECT CONFIRMED

According to independently developed hypotheses by Michael Darby (1975) and Martin Feldstein (1976) nominal interest rates will increase during an inflationary period by an amount which is greater than the expected rate of inflation. This occurs in order to compensate lenders for the expected loss of principal and for the taxation of the interest earned. While many authors comment on the plausibility of the Darby‐Feldstein effect, it has been difficult to support this hypotheses empirically.