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Real Interest Rates: What Accounts for Their Recent Rise?

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Real Interest Rates: What Accounts for Their Recent Rise? Real Interest Rates: What Accounts for Their Recent Rise? A. Steven Holland OMINAL interest rates have risen to unprece- Proxies for the expected rate of inflation frequently dented levels in the last five years, and the common are based on weighted averages of past inflation rates perception is that expected real rates of interest — or the predicted values from regression equations in rates minus expected inflation — have risen as well. which the inflation rate depends on past inflation These higher rates are blamed for a variety of eco- rates, past rates of money growth and a number of nomic ills including reduced capital investment and other variables.’ Because empirical results can be sen- slowdowns in such interest-sensitive sectors as hous- sitive to assumptions about the way expectations are ing and automobiles. formed, however, a potentially more fruitful approach is to use “observed” inflation forecasts to estimate Thispaper is concerned, first, with establishing that expected inflation.’ In this article, data from surveys of real interest rates have indeed been higher during the both short- and long-term inflation expectations are 1980s than in the previous two decades and, second, used to estimate short- and long-term expected real with examining possible causes of this major shift. Potential causes include changes in the expected rate rates of interest. of inflation, monetary policy, the state of the economy, This analysis oversimplifies the problem, since it taxes, federal budget deficits and the declining relative applies only to the expected real before-tax yield. price of energy. Since interest payments are taxable as earned income, the expected real after-tax yield )r*) is: ESTIMATES OF BEFORE- AND (3) r~= i — ti — AFTER-ThX REAL INTEREST BATES = (1—Ui — The real interest rate is not known with certainty at the time a security is purchased, but the purchaser where t is the marginal tax rate. An estimate of the has an expectation of it. The nominal interest rate, i, is average marginal tax rate on personal income is used the sum of the expected real rate of interest, r, and the below to estimate expected after-tax real interest rates. expected rate of inflation, fr: The estimates presented in this article are intended to represent the pattern of recent real interest rate (1) i = r + ~‘.‘ movements, not to provide completely accurate esti- The expected real rate, thus, can be estimated accord- mates of real interest rates at any point in time. Poten- ing to the formula: tial sources of error in the estimates include (but are not limited to): (a) measurement error in calculating (2) r = i — fr, the expected rate ofinflation, (b) the effects of different as long as an estimate of the expected inflation rate is available. ‘As pointed out by Santoni and Stone (1982), however, the difficulty with this procedure is that any change in economic policy or any A. Steven Holland is an economist at the Federal Reserve Bank of St. structural change or “shock” that affects inflation expectations will Louis. Jude L. Naes, Jr., provided research assistance. not be incorporated in the estimate of expected inflation. ‘This equption itt a’widely used approximation of the “Fisher equa- ‘For an example of the sensitivity of empirical results to assumptions tion.” See Fisher (1965). about expectations formation, see Holland (1984). 18 FEDERAL RESERVE BANK OF SI. LOUIS DECEMBER 1984 Chart 1 Percent Nominal and Real 1-Year Interest Rates Percent 16 Semiannual data 16 12 12 8 8 4 4 0 0 -4 -4 1960 62 64 66 68 70 72 74 76 78 80 82 1984 NOTE: Dashed lines represent overage levels of before- and after-tax real interest rates over selected time periods. marginal tax rates across market participants and (c) the Livingston survey from 1960 to the first half of the difference between the marginal tax rate expected 1984.’ Between 1960 and 1970, the nominal rate rose to hold at the time interest payments are receivedand from around 3 percent to over 7 percent. Estimates of 4 the current rate. Whenever real interest rates are re- ferred to in the following discussion, it will mean cx- ‘Joseph Livingston of The Philadelphia Inquirer conducts a survey of pected real interest rates. economists each spring and fall, requesting respondents to indicate their predictions of the consumer price index (CPI). Because the Estimates ofShort-Term Real survey results published, for example, in June contain predictions for the following December and June, Livingston refers to them as Interest Rates six- and 12-month-ahead forecasts as this article does. Becausethe respondents to the June survey are thought to know only the April Chart 1 plots nominal returns and estimates of the CPI, however, they are actuallypredicting eight- and 14-month rates before-and after-tax realreturns on one-year Treasury of change. For a detailed discussion of the Livingston expectations data, see Carlson (1977). This article uses the data in Carlson’s securities, based on one-year inflation forecasts from revised form updated to the present. The nominal interest rates used in the charts and table are the quarterly averages of the rates 4 for the quarter in which the Livingston survey was taken. The same 1n addition, the return that is relevant for decision-making depends calculations were made for six-month Treasury bills based on six- on risk and the tax burden on alternative uses of funds. More will be month inflation forecasts. Since the pattern of movements was said about risk later in the article. See Ezrati (1982) and Mehra nearly identical, however, only the one-year rates are reported. The (1984) for discussions of the implications of taxes on alternative estimate of the average marginal tax rate comes from Chase Econo- uses of funds. metrics. 19 FEDERAL RESERVE BANK OF ST. LOUIS DECEMBER 1984 Chart 2 Nominal and Real 10-Year Interest Rates Percent Semiannual data Percent 16 — — 16 12 12 ~±i /~ 8 8 ~naIrate ~_ 4 4 —— \~{7/\I Selore-tax real rate 0 -r 0 After-tax real rale -4 -4 1960 62 64 66 68 10 12 74 16 78 80 82 1984 the expected real rate indicate this was due primarily 1960s or 1970s. Short-term real interest rates, however, to higher expected inflation, since both the before- did not break with precedent until 1981 when before- and after-tax real rates appear to have risen only tax real rates climbed above the 6 percent level; they slightly, if at all, over the period. continued to rise through early 1982. After-tax real rates behaved in a similar fashion and, on average, Between 1971 and 1980, short-term nominal interest have been higher since 1981 than in the previous two rates, on average, were much higher than in the 1960s; decades. The difference isnot as great, however, as it is real rates, for the most part, were tower. In fact, esti- for before-tax real rates. Both nominal and real rates mated before-tax real rates were below 1 percent from have declined since early1982, but they remain at very the second half of1974 to the first halfof 1978 and were high levels relative to past history. even negative in late 1976 and early 1977. After-tax real rates were negative for nearly the entire period from 1974 to 1980. Nominal rates increased dramatically after 1977, with increases of about 200 basis points Estimates ofLong-Term Real occurring in late 1978 and again in late 1979. These Interest Rates increases, however, served only to bring real rates We expect long-term real interest rates to behave in closer to the levels that had prevailed before 1974. a manner broadly similar to short-term real rates; if From late 1979 to early 1982, short-term nominal short-term rates rise, long-term rates are forced up so interest rates were higher than at any time during the that realyields over any holding period are compara- 20 FEDERAL RESERVE BANK OF St LOUIS DECEMBER 1984 tile whether one holds short- or long-term bonds.’ Chart 2 plots the nominal yield on 10-year Treasury Because of data limitations, however, it is much more securities since 1960, as well as estimates of the 10- difficult to get an accurate representation of the mar- year, before- and after-tax real rates since 1978 based ket’s expectation of inflation over the distant future on the mean inflation forecasts from the survey. As than over the near future! In fact, it isonly since 1978 expected, the pattern of movements in long-term that a survey of expected inflation over periods sub- nominal rates during the 1960s and 1970s is similar to stantially longer than ayear has beenundertaken. The that in short-term rates. In particular, when short- survey, known as the Decision-Makers Poll, provides term nominal rates shot upward in the late 1970s, so estimates of expected inflation over the next five and did long-term nominal rates - Long-term real rates also 10 years.’ reached heights comparable to those of short-term real rates in 1981 and 1982? Thus, it appears that the increase in long-term real rates occurred at roughly ‘This assumes the absence of segmented markets. In other words. there is a high degree of substitutability between short- and long- the same time and was of roughly equal size as the term securities. This is not meant to imply that the term structure of increase in short-term real rates. interest rates does not change over time, only that short- and long- term interest rates behave in a broadly similar fashion. 7 The Term Structure of Real 1t is also more difficult to know the appropriate tax rate to use in calculating the after-tax yield, since interest payments are made Interest Rates much farther in the fUture.
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