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A Consumption-Based Model of the Term Structure of Interest Rates

TL;DR: This paper proposed a consumption-based model that can account for many features of the nominal term structure of interest rates, such as a time-varying price of risk generated by external habit.
Abstract: This paper proposes a consumption-based model that can account for many features of the nominal term structure of interest rates. The driving force behind the model is a time-varying price of risk generated by external habit. Nominal bonds depend on past consumption growth through habit and on expected inflation. When calibrated data on consumption, inflation, and the average level of bond yields, the model produces realistic volatility of bond yields and can explain key aspects of the expectations puzzle documented by Campbell and Shiller (1991) and Fama and Bliss (1987). When Actual consumption and inflation data are fed into the model, the model is shown to account for many of the short and long-run fluctuations in the short-term interest rate and the yield spread. At the same time, the model captures the high equity premium and excess stock market volatility.

Summary (4 min read)

Introduction

  • The negative correlation between surplus consumption and the riskfree rate leads to positive risk premia on real bonds, and an upward sloping yield curve.
  • Expected inflation is calibrated purely to match inflation data.
  • Like these models, the model proposed here assumes that the agent evaluates today’s consumption relative to a reference point that increases with past consumption.

1 Model

  • This section describes the model assumed in this paper.
  • Section 1.1 describes the assumptions for preferences, Section 1.2 describes the assumptions on the price level.
  • Section 1.3 describes the solution method, and Section 1.4 discusses consequences for risk premia on real and nominal bonds.

1.1 Preferences

  • The sensitivity function λ(st) will be described below.
  • In the model of Campbell and Cochrane (1999), the mechanism in (10) does not create timevarying risk premia on bonds for the simple reason that bond returns are constant, and equal to the riskfree rate at all maturities.

1.2 Inflation

  • For simplicity, the authors follow Boudoukh (1993) and Cox, Ingersoll, and Ross (1985), and model inflation as an exogenous process.
  • The correlation between inflation, Zt and consumption can be modeled in a parsimonious way by writing the consumption growth shock vt+1 as vt+1 = σc²t+1.
  • This structure allows for an arbitrary number of state variables and cross-correlations.
  • Multiple lags may be accommodated by increasing the dimension of Zt. 5Harvey (1989) provides direct evidence that the the risk-return tradeoff varies counter-cyclically.
  • 6Since an earlier version of this paper circulated, Buraschi and Jiltsov (2003) study a related model that puts the money supply directly in the utility function.

1.3 Model Solution

  • This section calculates the prices of long-term bonds and stocks.
  • To compute prices on nominal bonds, techniques from affine bond pricing7 are combined with numerical methods.
  • Introducing affine bond pricing techniques improves the efficiency of the calculation and provides insight into the workings of the model.

Bond Prices

  • This paper solves for prices of both real bonds (bonds whose payment is fixed in terms of units of the consumption good) and nominal bonds (bonds whose payoff is fixed in terms of units of the price level).
  • This implies the boundary condition: P0,t = 1.
  • For this problem, numerical integration is superior to calculating the expectation by Monte Carlo.
  • Equation (14) indicates that, unlike real bond prices, nominal bond prices are functions of the state variable Zt as well as st.
  • These formulas can also be used to gain insight into the workings of the model, as explained in Section 1.4.

Aggregate Wealth

  • The market portfolio is equivalent to aggregate wealth, and the dividend equals aggregate consumption.
  • The price-consumption ratio and the return on the market can be calculated using methods similar to those above, with a small but important modification.
  • Because these assets pay no coupons, they have the same recursive pricing relation as bonds (16).
  • Of course the prices are different, and this is because there is a different boundary condition: P e0,t = Ct. 1.
  • This formula can be solved recursively using one-dimensional quadrature.

1.4 Implications for bond risk premia

  • Of interest is the risk premium on the nominal riskfree asset.
  • If σπσc < 0, the one-period nominal bond has a positive risk premium relative to the one-period real bond.
  • Intuitively, this is because σπσ ′ c < 0 implies that inflation and consumption growth are negatively correlated.
  • In general, there is no closed form expression for nominal or real bond prices with maturity greater than one period.
  • These can be determined in some special cases, as described below.

Special cases

  • As long as expected inflation varies, the nominal riskfree rate also varies.
  • These risk premia vary with st, and it is again not possible to solve for bond prices in closed form.
  • Then inflation risk is not priced, and the same reasoning as above shows that P $n,t = exp{−nrf} exp{An +BnZt}.
  • Thus risk premia on nominal bonds are zero except for a constant Jensen’s inequality term.

2 Estimation

  • The results of the previous section suggest that the process assumed for expected inflation will be an important determinant of yields and returns on nominal bonds.
  • This is equivalent to assuming that realized inflation follows an ARMA(1,1) process.
  • Equations (26)–(28) imply an exact likelihood function.
  • The left column reports the parameter estimate, the right column reports the standard error.

3 Implications for Asset Returns

  • This section describes the implications of the model for returns on bonds and stocks.
  • Section 3.1 describes the calibration of the parameters, and the data used to calculate moments of nominal bonds for comparison.
  • Section 3.2 characterizes the price-dividend ratio and the yield spread on real and nominal bonds as functions of the underlying state variables st and expected inflation.
  • Section 3.3 evaluates the model by simulating 100,000 quarters of returns on stocks and nominal and real bonds and compares the simulated moments implied by the model to those on stocks and nominal bonds in the data.
  • Lastly, Section 3.4 shows the implications of the model for the time series of the short-term interest rate and the yield spread, and examines the properties of implied bond risk premia using the technique proposed by Dai and Singleton (2002).

3.1 Calibration

  • The processes for consumption and inflation are calibrated using the estimation of Section 2, while the preference parameters are calibrated using bond and stock returns.9.
  • Then σc and σπ can be found by taking the Cholesky decomposition of the right hand side of (29).
  • Boudoukh fits consumption and inflation parameters to consumption and inflation data, and preference parameters to bond returns.
  • This implies that when the nominal riskfree rate in the model is evaluated at s̄, it equals the yield on the three-month bond.
  • The simulation results in Section 3.3 show that the difference is small.

3.2 Characterizing the Solution

  • As shown in Figure 3, the price-dividend ratio increases with surplus consumption St. As the pricedividend ratio is often taken to be a measure of the business cycle (e.g. Lettau and Ludvingson (2001)), this confirms the intuition that St is a procyclical variable.
  • 10A potential concern with this regression is the relatively high degree of persistence in the surplus consumption ratio.
  • 16 Figure 4 plots the yields on nominal and real bonds for maturities of three months and ten years.
  • Both nominal and real yields decrease with St, but the long yields are more sensitive to St than the short yields.
  • Both long and short-term yields are increasing in expected inflation.

3.3 Simulation

  • To evaluate the predictions of the model for asset returns, 100,000 quarters of data are simulated.
  • Prices of the claim on aggregate consumption , of real, and nominal bonds are calculated numerically, using the method described in Section 1.3.

Returns on the Aggregate Market

  • Table 3 shows the implications of this model for equity returns.
  • The implications of the present model for equity returns are nearly identical to those of Campbell and Cochrane (1999).
  • The model fits the mean and standard deviation of equity returns, even though it was calibrated only to match the ratio.
  • The persistence φ is chosen so that the model fits the correlation of the price-dividend ratio by construction.
  • In addition, results available from the author show that price-dividend ratios have the ability to predict excess returns on equities, just as in the data (Campbell and Shiller (1988), Fama and French (1989)), and that declines in the price-dividend ratio predict higher volatility (Black (1976), Schwert (1989), Nelson (1991)).

Bond Returns

  • Table 4 shows the implications of the model for means and standard deviations of real and nominal bond yields.
  • The model produces average nominal yields that are very similar to those in the data for bonds between maturities of 3 months and 5 years.
  • The previous discussion shows that interest rate risk leads both real and nominal bonds to have positive risk premia.
  • This section shows that risk premia are indeed time-varying, and explains why.
  • 17 While the model succeeds in fitting the pattern of the coefficients in the data, the magnitude of the difference between the slope coefficients and one is smaller in the model than in the data.

3.4 Implications for the Time Series

  • The previous section shows the implications of the model for the population values of aggregate market moments, bond yields, and Campbell and Shiller (1991) regression coefficients.
  • Zt, it is possible to calculate the model’s implications for nominal yields.
  • The argument in Section 3.1 shows that this series is equal to Zt. 20For the 3-month nominal yield, (23) is an approximate closed-form expression.
  • 23 the higher frequency movements in the 70s, and overall, the correlation between the yield spread implied by the model and that in the data is .40.
  • 24 Figure 9 plots the coefficients βRn from the regression (36), along with the coefficients βn from (34) found in the data.

4 Conclusion

  • This paper offers a theory of the nominal term structure based on the preferences of a representative agent.
  • Nevertheless, the implied volatility of yields is close to the sample estimates of nominal yield volatility in the data.
  • This suggests that surplus consumption, which, along with expected inflation drives changes in yields in the model, is a determinant of yields in the data.
  • The second test is whether, when the Campbell-Shiller regressions are adjusted by risk premia on bonds implied by the model, the slope coefficients are closer to unity.
  • In summary, the model is able to capture many of the properties of moments of bond returns in the data, and explain much of the time series variation in short and long-term bond yields.

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The Rodney L. White Center for Financial Research
A Consumption-Based Model of the
Term Structure of Interest Rates
Jessica A. Wachter
27-04

A Consumption-Based Model of the Term Structure
of Interest Rates
Jessica A. Wachter
University of Pennsylvania and NBER
July 9, 2004
I thank Andrew Ang, Ravi Bansal, Michael Brandt, Geert Bekaert, John Campbell, John Cochrane,
Francisco Gomes, Vassil Konstantinov, Martin Lettau, Anthony Lynch, David Marshall, Lasse Pederson,
Andre Perold, Ken Singleton, Christopher Telmer, Jeremy Stein, Matt Richardson, Stephen Ross, Robert
Whitelaw, Yihong Xia, seminar participants at the 2004 Western Finance Association meeting in Vancouver,
the 2003 Society of Economic Dynamics meeting in Paris, and the 2001 NBER Asset Pricing meeting in
Los Angeles, the the NYU Macro lunch, the New York Federal Reserve, Washington University, and the
Wharton School. I thank Lehman Brothers for financial support.
Address: The Wharton School, University of Pennsylvania, 3620 Locust Walk, Philadelphia, PA 19104;
Tel: (215) 898-7634; Email: jwachter@wharton.upenn.edu; http://finance.wharton.upenn.edu/˜ jwachter/

A Consumption-Based Model of the Term Structure
of Interest Rates
Abstract
This paper proposes a consumption-based model that can account for many features of the
nominal term structure of interest rates. The driving force behind the model is a time-varying
price of risk generated by external habit. Nominal bonds depend on past consumption growth
through habit and on expected inflation. When calibrated to data on consumption, inflation, and
the average level of bond yields, the model produces realistic volatility of bond yields and can
explain key aspects of the expectations puzzle documented by Campbell and Shiller (1991) and
Fama and Bliss (1987). When actual consumption and inflation data are fed into the model, the
model is shown to account for many of the short and long-run fluctuations in the short-term interest
rate and the yield spread. At the same time, the model captures the high equity premium and
excess stock market volatility.

Citations
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TL;DR: In this article, a parsimonious regime switching model is used to uncover two states in which expected consumption growth is low, one with high and one with negative expected in ation.
Abstract: In a parsimonious regime switching model, expected consumption growth varies over time. Adding in ation as a conditioning variable, we uncover two states in which expected consumption growth is low, one with high and one with negative expected in ation. Embedded in a general equilibrium asset pricing model with learning, these dynamics replicate the observed time variation in stock return volatilities and stock-bond return correlations. Furthermore, they provide an alternative way to come up with a measure of time-varying disaster risk in the spirit of Wachter (2013). Our findings imply that both the disaster and the long-run risk paradigm can be extended towards explaining movements in the stock-bond return correlation.

2 citations


Cites background from "A Consumption-Based Model of the Te..."

  • ...In traditional New-Keynesian models, for instance, inflation and consumption growth are typically positively correlated, whereas finance researchers like Wachter (2006) argue that a negative correlation is necessary to match asset prices....

    [...]

Posted Content
TL;DR: In this paper, the authors analyzed optimal consumption and investment for agents whose consumption cannot fall over time, with constant relative risk aversion conditional on consumption never falling, and they can be represented as non-time-separable extended real-valued von Neumann-Morgenstern preferences.
Abstract: A constraint that consumption cannot fall over time (or can fall only at a limited rate) can arise directly from preferences or indirectly from internal production considerations. For example, much of a university's budget includes expenditures that must be maintained because of implicit and explicit long-term contracts. Similarly, expenditures on consumer durables are also long-term commitments. This paper analyses optimal consumption and investment for agents whose consumption cannot fall over time. The preferences are time-separable with constant relative risk aversion conditional on consumption never falling, and they can be represented as non-time-separable extended-real-valued von Neumann-Morgenstern preferences unconditionally. Optimal consumption increases each time that wealth achieves a new maximum. Optimal investment at a point in time is similar to constant proportions portfolio insurance, but the dynamics are different due to the form of consumption dynamics. Extensions include bounding the rate of decrease in consumption with a constant other than zero and the placement of a bound on the maximal holding of the risky asset as a proportion of wealth.

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Journal ArticleDOI
TL;DR: In this article, a consumption-based model that accounts for term premiums of the nominal term structure of interest rates is proposed, which focuses on ex ante term premiums, which depend on the volatility processes of real consumption and inflation.
Abstract: This paper proposes a consumption-based model that accounts for term premiums of the nominal term structure of interest rates. The model focuses on ex ante term premiums, which depend on the volatility processes of real consumption and inflation. The contribution of the paper is to derive and test a parsimonious model that highlights linear relationship between term premiums and next period conditional volatilities. When calibrated to US data on interest rates, consumption and inflation, the model accounts for the C-CAPM expectations puzzle. Risk aversion coefficients between 2 and 7 are elicited.

2 citations


Cites background from "A Consumption-Based Model of the Te..."

  • ...Campbell and Cochrane (1999) and Wachter (2006) suggest that bond and equity risk premiums should covary with shocks of aggregate consumption....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the authors considered the long-term consumption growth rate and the risk-free rate in the context of cash equivalents as a multi-period investment strategy that hedges against adverse growth rate outcomes.
Abstract: The equity risk premium and risk-free rate puzzles are largely resolved by combining persistent uncertainty over the long-term consumption growth rate with analysis of the risk-free asset on a ‘roll-over’ basis. Under these conditions, cash equivalents are evaluated as a multi-period investment strategy that hedges against adverse growth rate outcomes. The premium on the risky asset is raised and the risk-free rate lowered due to their respective relation with multi-period consumption risk. Historical average asset returns are matched at plausible risk aversion.

2 citations


Cites background from "A Consumption-Based Model of the Te..."

  • ...…literature also bemoans the tendency for consumption-based models to generate downward-sloping yield curves unless restrictions are placed on either preferences or the correlation between inflation and consumption (see for example Brandt and Wang 2003; Wachter 2006; Piazzesi and Schneider 2007)....

    [...]

References
More filters
Journal ArticleDOI
TL;DR: In this article, an exponential ARCH model is proposed to study volatility changes and the risk premium on the CRSP Value-Weighted Market Index from 1962 to 1987, which is an improvement over the widely-used GARCH model.
Abstract: This paper introduces an ARCH model (exponential ARCH) that (1) allows correlation between returns and volatility innovations (an important feature of stock market volatility changes), (2) eliminates the need for inequality constraints on parameters, and (3) allows for a straightforward interpretation of the "persistence" of shocks to volatility. In the above respects, it is an improvement over the widely-used GARCH model. The model is applied to study volatility changes and the risk premium on the CRSP Value-Weighted Market Index from 1962 to 1987. Copyright 1991 by The Econometric Society.

10,019 citations


Additional excerpts

  • ...In addition, results available from the author show that price–dividend ratios have the ability to predict excess returns on equities, just as in the data (Campbell and Shiller, 1988; Fama and French, 1989), and that declines in the price–dividend ratio predict higher volatility (Black, 1976; Schwert, 1989; Nelson, 1991)....

    [...]

  • ...…from the author show that price–dividend ratios have the ability to predict excess returns on equities, just as in the data (Campbell and Shiller, 1988; Fama and French, 1989), and that declines in the price–dividend ratio predict higher volatility (Black, 1976; Schwert, 1989; Nelson, 1991)....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the authors use an intertemporal general equilibrium asset pricing model to study the term structure of interest rates and find that anticipations, risk aversion, investment alternatives, and preferences about the timing of consumption all play a role in determining bond prices.
Abstract: This paper uses an intertemporal general equilibrium asset pricing model to study the term structure of interest rates. In this model, anticipations, risk aversion, investment alternatives, and preferences about the timing of consumption all play a role in determining bond prices. Many of the factors traditionally mentioned as influencing the term structure are thus included in a way which is fully consistent with maximizing behavior and rational expectations. The model leads to specific formulas for bond prices which are well suited for empirical testing. 1. INTRODUCTION THE TERM STRUCTURE of interest rates measures the relationship among the yields on default-free securities that differ only in their term to maturity. The determinants of this relationship have long been a topic of concern for economists. By offering a complete schedule of interest rates across time, the term structure embodies the market's anticipations of future events. An explanation of the term structure gives us a way to extract this information and to predict how changes in the underlying variables will affect the yield curve. In a world of certainty, equilibrium forward rates must coincide with future spot rates, but when uncertainty about future rates is introduced the analysis becomes much more complex. By and large, previous theories of the term structure have taken the certainty model as their starting point and have proceeded by examining stochastic generalizations of the certainty equilibrium relationships. The literature in the area is voluminous, and a comprehensive survey would warrant a paper in itself. It is common, however, to identify much of the previous work in the area as belonging to one of four strands of thought. First, there are various versions of the expectations hypothesis. These place predominant emphasis on the expected values of future spot rates or holdingperiod returns. In its simplest form, the expectations hypothesis postulates that bonds are priced so that the implied forward rates are equal to the expected spot rates. Generally, this approach is characterized by the following propositions: (a) the return on holding a long-term bond to maturity is equal to the expected return on repeated investment in a series of the short-term bonds, or (b) the expected rate of return over the next holding period is the same for bonds of all maturities. The liquidity preference hypothesis, advanced by Hicks [16], concurs with the importance of expected future spot rates, but places more weight on the effects of the risk preferences of market participants. It asserts that risk aversion will cause forward rates to be systematically greater than expected spot rates, usually

7,014 citations

Journal ArticleDOI
TL;DR: This paper showed that an equilibrium model which is not an Arrow-Debreu economy will be the one that simultaneously rationalizes both historically observed large average equity return and the small average risk-free return.

6,141 citations


"A Consumption-Based Model of the Te..." refers methods in this paper

  • ...Thus, the model can fit the equity premium puzzle of Mehra and Prescott (1985)....

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Journal ArticleDOI
TL;DR: For example, this paper found that expected returns on common stocks and long-term bonds contain a term or maturity premium that has a clear business-cycle pattern (low near peaks, high near troughs).

4,110 citations


Additional excerpts

  • ...In addition, results available from the author show that price–dividend ratios have the ability to predict excess returns on equities, just as in the data (Campbell and Shiller, 1988; Fama and French, 1989), and that declines in the price–dividend ratio predict higher volatility (Black, 1976; Schwert, 1989; Nelson, 1991)....

    [...]

  • ...…from the author show that price–dividend ratios have the ability to predict excess returns on equities, just as in the data (Campbell and Shiller, 1988; Fama and French, 1989), and that declines in the price–dividend ratio predict higher volatility (Black, 1976; Schwert, 1989; Nelson, 1991)....

    [...]

Posted Content
TL;DR: In this paper, a consumption-based model is proposed to explain a wide variety of dynamic asset pricing phenomena, including the procyclical variation of stock prices, the long-term horizon predictability of excess stock returns, and the countercyclical variations of stock market volatility.
Abstract: We present a consumption†based model that explains a wide variety of dynamic asset pricing phenomena, including the procyclical variation of stock prices, the long†horizon predictability of excess stock returns, and the countercyclical variation of stock market volatility. The model captures much of the history of stock prices from consumption data. It explains the short†and long†run equity premium puzzles despite a low and constant risk†free rate. The results are essentially the same whether we model stocks as a claim to the consumption stream or as a claim to volatile dividends poorly corelated with consumption. The model is driven by an independently and identically distributed consumption growth process and adds a slow †moving external habit to the standard power utility function. These features generate slow countercyclical variation in risk premia. The model posits a fundamentally novel description of risk premia. Investors fear stocks primarily because they do poorly in recessions unrelated to the risks of long†run average consumption growth.

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This paper proposes a consumption-based model that can account for many features of the nominal term structure of interest rates.