Equilibrium Yield Curve, Phillips Correlation, and Monetary Policy

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1 Equilibrium Yield Curve, Phillips Correlation, and Monetary Policy Mitsuru Katagiri International Monetary Fund October 24, University 1 / 42

2 Disclaimer The views expressed here are those of the author and do not necessarily represent the views of the IMF, its Executive Board, or IMF management. 2 / 42

3 Motivation Yield curves are upward sloping on average (=positive term premiums) in most advanced economies In a standard consumption based asset pricing model, term premiums are usually negative and small bond premium puzzle (Backus et al., 1989) 3 / 42

4 Motivation Yield curves are upward sloping on average (=positive term premiums) in most advanced economies In a standard consumption based asset pricing model, term premiums are usually negative and small bond premium puzzle (Backus et al., 1989) Questions: Can positive term premiums be rationalized by consumers optimization under the observed income/inflation? 3 / 42

5 Motivation Yield curves are upward sloping on average (=positive term premiums) in most advanced economies In a standard consumption based asset pricing model, term premiums are usually negative and small bond premium puzzle (Backus et al., 1989) Questions: Can positive term premiums be rationalized by consumers optimization under the observed income/inflation? How does the monetary policy influence term premiums? In particular, what does the model predict about yield curves under permanently low interest rates with the ZLB? 3 / 42

6 This Paper Analyze the equilibrium yield curve in a model with optimal savings as a buffer stock (Deaton, 1991) The exogenous income/inflation process is estimated by data Nominal interest rates are set by a monetary policy rule Changes in a monetary policy behavior can be analyzed 4 / 42

7 This Paper Analyze the equilibrium yield curve in a model with optimal savings as a buffer stock (Deaton, 1991) The exogenous income/inflation process is estimated by data Nominal interest rates are set by a monetary policy rule Changes in a monetary policy behavior can be analyzed Conduct a counterfactual simulation for a permanently low interest rate environment with the ZLB (low-for-long) 4 / 42

8 Previous Literature on Term Structure Euler equation with exogenous consumption and inflation Approach #1: compute equilibrium yield curves by the Euler equation under exogenous inflation and consumption Backus et al. (1989), Boudoukh (1993), Wachter (2006), Piazzesi and Schneider (2007), Bansal and Shaliastovich (2013), Branger et al. (2016) Main takeaway: To rationalize positive term premiums, corr( c t, π t ) < 0 is necessary. Why? 5 / 42

9 Previous Literature on Term Structure Why is corr( c t, π t ) < 0 necessary? Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) where M t,t+1 : Nominal SDF = E t (Q 1,t+1 )/R t + cov(e t+1 (M t+1,t+2 ), M t,t+1 ) 6 / 42

10 Previous Literature on Term Structure Why is corr( c t, π t ) < 0 necessary? Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) where M t,t+1 : Nominal SDF = E t (Q 1,t+1 )/R t + cov(e t+1 (M t+1,t+2 ), M t,t+1 ) Term premiums > 0 iff cov(e t+1 (M t+1,t+2 ), M t,t+1 ) < 0 6 / 42

11 Previous Literature on Term Structure Why is corr( c t, π t ) < 0 necessary? Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) where M t,t+1 : Nominal SDF = E t (Q 1,t+1 )/R t + cov(e t+1 (M t+1,t+2 ), M t,t+1 ) Term premiums > 0 iff cov(e t+1 (M t+1,t+2 ), M t,t+1 ) < 0 Autocorrelation for c t and π t is positive in data Negative and small term premiums in a standard model 6 / 42

12 Previous Literature on Term Structure Why is corr( c t, π t ) < 0 necessary? Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) where M t,t+1 : Nominal SDF = E t (Q 1,t+1 )/R t + cov(e t+1 (M t+1,t+2 ), M t,t+1 ) Term premiums > 0 iff cov(e t+1 (M t+1,t+2 ), M t,t+1 ) < 0 Autocorrelation for c t and π t is positive in data Negative and small term premiums in a standard model corr( c t, π t ) < 0 is necessary for positive term premium Intuition: An inflation hike is a bad news for both nominal bond prices and future consumption growth 6 / 42

13 Previous Literature on Term Structure Empirical observations and challenges corr( c t, π t ) < 0 is empirically observed in most economies corr( c t, π t ) = 0.19 in the US from 1959Q2 to 2017Q1 Euler eq. based on EZ preference accounts for the US yield curve under corr( c t, π t ) < 0 (Piazzesi and Schneider, 2007) 7 / 42

14 Previous Literature on Term Structure Empirical observations and challenges corr( c t, π t ) < 0 is empirically observed in most economies corr( c t, π t ) = 0.19 in the US from 1959Q2 to 2017Q1 Euler eq. based on EZ preference accounts for the US yield curve under corr( c t, π t ) < 0 (Piazzesi and Schneider, 2007) Challenges for Approach #1: 1. Changes in a monetary policy behavior (e.g., the zero lower bound) are difficult to analyze 2. Consistency with macroeconomic variables is out of scope 7 / 42

15 Previous Literature on Term Structure A general equilibrium model with endogenous consumption (and inflation) Approach #2: analyzes equilibrium yield curves in a general equilibrium with endogenous consumption (and inflation) Campbell et al. (2012), Rudebusch and Swanson (2008, 2012), van Binsgergen et al. (2012), Hsu et al. (2015), Gourio and Ngo (2016), Nakata and Tanaka (2016), Gallmeyer et al. (2007, 2017) Nominal interest rates are not endogenous variables but set by a policy reaction function to inflation, R t = ϕ π π t where ϕ π > 1 Again, corr( c t, π t ) < 0 is a necessary feature for positive term premiums. Why? 8 / 42

16 Previous Literature on Term Structure A general equilibrium model with endogenous consumption (and inflation) Let us think about 2-period bond price, Q 2,t, again. The covariance term is: cov(e t+1 (M t+1,t+2 ), M t,t+1 ) = cov(1/r t+1, M t,t+1 ) cov(1/π t+1, 1/ c t+1 ) The covariance term is negative iff corr( c t, π t ) < 0 9 / 42

17 Previous Literature on Term Structure A general equilibrium model with endogenous consumption (and inflation) Let us think about 2-period bond price, Q 2,t, again. The covariance term is: cov(e t+1 (M t+1,t+2 ), M t,t+1 ) = cov(1/r t+1, M t,t+1 ) cov(1/π t+1, 1/ c t+1 ) The covariance term is negative iff corr( c t, π t ) < 0 Challenges for Approach #2: 1. Inflation determinacy in the low-for-long faces some difficulty 9 / 42

18 Previous Literature on Term Structure A general equilibrium model with endogenous consumption (and inflation) Let us think about 2-period bond price, Q 2,t, again. The covariance term is: cov(e t+1 (M t+1,t+2 ), M t,t+1 ) = cov(1/r t+1, M t,t+1 ) cov(1/π t+1, 1/ c t+1 ) The covariance term is negative iff corr( c t, π t ) < 0 Challenges for Approach #2: 1. Inflation determinacy in the low-for-long faces some difficulty 2. It is hard to reconcile corr( c t, π t ) < 0 with macroeconomic behaviors including the Phillips correlation Does corr( c t, π t ) < 0 mean that real economic activity and inflation should be negatively correlated? 9 / 42

19 Preview of Main Results The model can account for upward sloping yield curves even under the Phillips correlation A difference between a stationary and non-stationary part of income and their relationship with inflation is a key Real term premiums explain a large part of term premiums Low-for-long would entail flatter yield curves by reducing real term premiums around the zero lower bound Bank profits from the maturity transformation could face difficulty in the low-for-long (GFSR, 2017) 10 / 42

20 Empirical Preliminaries 11 / 42

21 Yield Curve Average Level Standard Deviation O/N 5Y 10Y O/N 5Y 10Y U.S (1959Q2-2017Q1) (0.00) (0.74) (1.07) (1.00) (0.83) (0.77) U.K (1957Q2-2017Q1) (0.00) (0.51) (0.84) (1.00) (0.96) (0.91) Germany (1975Q2-2017Q1) (0.00) (1.90) (2.41) (1.00) (1.15) (1.04) Japan (1975Q2-2017Q1) (0.00) (0.45) (0.85) (1.00) (0.94) (0.85) Average yield curves are upward sloping for all countries Volatility is a bit smaller for longer yields except for Germany 12 / 42

22 Phillips Correlation Dependent variable: Inf t U.S. U.K. Germany Japan (59Q2-17Q1) (57Q2-17Q1) (75Q2-17Q1) (75Q2-17Q1) Inf t gap t gap t Note: Variables with ** and * are statistically significant at 1% and 5% level. Phillips correlation is statistically significant for lagged income gap (i.e., gap t 1 ) for all countries except for Japan Income gap is defined as a deviation of household disposable income from the HP-filter trend Inflation is Q-on-Q changes in the PCE deflatpr 13 / 42

23 Model 14 / 42

24 Overview A representative agent model with buffer-stock savings pioneered by Deaton (1991) and Carroll (1992) One-period nominal bonds are only choice for savings Income/inflation follow an exogenous process with correlation Nominal interest rates are set by a monetary policy rule 15 / 42

25 Budget Constraint The representative household s budget constraint: P t c t + B t + ( ) Bt Q n,t B n,t +Φ = P t Y t +B t 1 + Q n 1,t B n,t 1 R t R n>1 t n>1 P t : price level, Y t : real income, c t : consumption, R t : nominal interest rate, B t : nominal one-period bond, B n,t : n-period nominal bonds, Q n,t : n-period bond prices, Φ( ): costs for bond holdings Assume a tiny cost for bonds to avoid divergence satisfying ( ) ( ) Φ Bt > 0 and Φ Bt > 0 R t R t 16 / 42

26 Income and inflation Household real income (Y t ) consists of the non-stationary part (yt ) and the stationary part (y t ): log(y t ) = log(yt ) + log(y t ) where g t yt /yt 1 and y t are stationary 17 / 42

27 Income and inflation Household real income (Y t ) consists of the non-stationary part (yt ) and the stationary part (y t ): log(y t ) = log(yt ) + log(y t ) where g t yt /yt 1 and y t are stationary Similarly, inflation (Π t P t /P t 1 ) consists of the trend (πt ) and the cycle (π t ) as in Cogley and Sbordone (2008): log(π t ) = log(πt ) + log(π t ) where ξ t πt /πt 1 and π t are stationary 17 / 42

28 Detrending The economy is detrended by P t, πt and yt : Bond : b t = B t /(P t yt πt ) and b n,t = B n,t /(P t yt πt n ) Price : R t = R t /πt and Q n,t = πt n Q n,t Consumption : c t = c t /yt 18 / 42

29 Detrending The economy is detrended by P t, π t and y t : Bond : b t = B t /(P t y t π t ) and b n,t = B n,t /(P t y t π t n ) Price : R t = R t /π t and Q n,t = π t n Q n,t Consumption : c t = c t /y t The budget constraint after detrending: c t + b t + ( ) bt Q n,t b n,t + Φ = 1 + b t 1 + Q n>1 n 1,t b n,t 1 n R t R n>1 t g t π t ξ t g t π t ξ t 18 / 42

30 Monetary Policy and Bond Holding Cost Nominal interest rates, R t, are set by a policy rule R t = R ϕ r t 1 [ π t g ( Πt π t ) ϕπ ( ) ] 1 ϕr ϕy Yt y t R t = ( Rt 1 ξ t ) ϕr [ g π ϕ π t ] y ϕ 1 ϕr y t A cost for bond holdings is assumed to be quadratic: ( ) bt Φ ϕ ( ) 2 b bt b R R t 2 R t R t 19 / 42

31 Optimization problem The household maximizes the value function based on the Epstein-Zin-Weil preference: V t = { c 1 σ t + βe t [ V 1 α t+1 ] 1 σ 1 α where σ: inverse of IES, α: CRRA coefficient } 1 1 σ 20 / 42

32 Optimization problem The household maximizes the value function based on the Epstein-Zin-Weil preference: V t = { c 1 σ t + βe t [ V 1 α t+1 ] 1 σ 1 α where σ: inverse of IES, α: CRRA coefficient } 1 1 σ The supply of b n,t is assumed to be zero in equilibrium 20 / 42

33 Optimization problem The household maximizes the value function based on the Epstein-Zin-Weil preference: V t = { c 1 σ t + βe t [ V 1 α t+1 ] 1 σ 1 α where σ: inverse of IES, α: CRRA coefficient } 1 1 σ The supply of b n,t is assumed to be zero in equilibrium The model consists of two endogenous, (b t 1, R t 1 ), and four exogenous state variables, (g t, ξ t, y t, π t ) 20 / 42

34 Euler Equation The equilibrium is characterized by the Euler equations R t E t [M t,t+1 ] = 1 and E t [Q n 1,t+1 M t,t+1 ] = Q n,t, n > 1 M t,t+1 is the nominal SDF from period t to t + 1: M t,t+1 = β π t+1 ( ct+1 c t ) σ V t+1 ) 1 1 α E t ( V 1 α t+1 σ α 21 / 42

35 Yield Curve and Term Premiums The yield for each maturity, R n,t : ( 1 R n,t = Q n,t ) 1 n Bond prices and yields for risk-neutral agents, ˆQ n,t and ˆR n,t : ( 1 E t [ ˆQ n 1,t+1 ] = ˆQ n,t and ˆR n,t = R t Term premiums, ψ n,t, are defined as: 1 ˆQ n,t ) 1 n, n > 1 ψ n,t = R n,t ˆR n,t 22 / 42

36 Quantitative Analysis 23 / 42

37 Calibration Most parameter values are calibrated to standard values b is the average asset-income ratio in the U.S. Examines several values for α and the monetary policy rule Parameters Values Discount rate, β Inverse of IES, σ 1.0 Risk averseness, α Cost for bond holdings, ϕ b Steady-state savings, b 4.8 Monetary policy rule: Response to inflation, ϕ π 1.50 Response to growth, ϕ y 0.25 Interest rate smoothing, ϕ r / 42

38 Income and inflation processes Income: g t yt /yt 1 and y t follow log(g t ) = ρ g log(g t 1 ) + ε g,t log(y t ) = ρ y log(y t 1 ) + ε y,t where cov(ε g,t, ε y,t ) = 0 25 / 42

39 Income and inflation processes Income: g t yt /yt 1 and y t follow log(g t ) = ρ g log(g t 1 ) + ε g,t log(y t ) = ρ y log(y t 1 ) + ε y,t where cov(ε g,t, ε y,t ) = 0 Inflation: ξ t π t /π t 1 and π t follow log(ξ t ) = ρ ξ log(ξ t 1 ) + ε ξ,t log(π t ) = ρ π log(π t 1 ) + κ log(y t 1 ) + ε π,t 25 / 42

40 Income and inflation processes Income: g t yt /yt 1 and y t follow log(g t ) = ρ g log(g t 1 ) + ε g,t log(y t ) = ρ y log(y t 1 ) + ε y,t where cov(ε g,t, ε y,t ) = 0 Inflation: ξ t π t /π t 1 and π t follow log(ξ t ) = ρ ξ log(ξ t 1 ) + ε ξ,t log(π t ) = ρ π log(π t 1 ) + κ log(y t 1 ) + ε π,t Phillips correlation is captured by two channels: 1. The lagged income gap, y t 1, can influence π t as in data 2. ε π,t can be correlated with income shocks: cov(ε π,t, ε g,t ) 0 and cov(ε π,t, ε y,t ) 0 25 / 42

41 Estimation of Income and inflation processes The parameters are estimated by a Bayesian method using log(π) and log(y t ) as observable variables Data: Personal disposable income and PCE deflator Sample periods: 1957Q2-2017Q1 for UK, 1959Q2-2017Q1 for US, and 1975Q2-2017Q1 for Germany and Japan 26 / 42

42 Estimation of Income and inflation processes The parameters are estimated by a Bayesian method using log(π) and log(y t ) as observable variables Data: Personal disposable income and PCE deflator Sample periods: 1957Q2-2017Q1 for UK, 1959Q2-2017Q1 for US, and 1975Q2-2017Q1 for Germany and Japan For identification of trend and cycle, assume that: 1. Ratio of trend and cycle volatility for inflation, σ ξ /σ π, is 1.0% 2. There is a tight prior distribution for ρ y and ρ ξ 26 / 42

43 Estimation of Income and inflation processes The parameters are estimated by a Bayesian method using log(π) and log(y t ) as observable variables Data: Personal disposable income and PCE deflator Sample periods: 1957Q2-2017Q1 for UK, 1959Q2-2017Q1 for US, and 1975Q2-2017Q1 for Germany and Japan For identification of trend and cycle, assume that: 1. Ratio of trend and cycle volatility for inflation, σ ξ /σ π, is 1.0% 2. There is a tight prior distribution for ρ y and ρ ξ 10 parameters to be estimated: (ρ g, ρ y, σ g, σ y, ρ ξ, ρ π, σ π, κ, σ π,g, σ π,y ) 26 / 42

44 Estimation Result Name Prior Posterior US UK Germany Japan ρ g Beta (0.50,0.25) [0.32,0.75] [0.39,0.86] [0.01,0.62] [0.59,0.83] ρ y Beta (0.75,0.05) [0.68,0.84] [0.64,0.82] [0.69,0.85] [0.69,0.85] ρ ξ Beta (0.95,0.03) [0.95,0.99] [0.94,0.99] [0.89,0.98] [0.96,1.00] ρ π Beta (0.50,0.25) [0.35,0.70] [0.11,0.34] [0.08,0.39] [0.42,0.75] κ Uniform (-1,1) [-0.04,0.32] [0.04,0.23] [0.10,0.33] [-0.37,0.24] The lagged income gap has positive effects on inflation (i.e., κ > 0) except for Japan 27 / 42

45 Estimation Result (Cont d) Name Prior Posterior US UK Germany Japan σ g Inv.Gamma (0.3,Inf) [0.10,0.40] [0.06,0.33] [0.08,0.47] [0.06,0.11] σ y Inv.Gamma (0.4,Inf) [0.15,0.37] [1.51,2.28] [0.19,0.57] [0.07,0.11] σ π Inv.Gamma (0.3,Inf) [0.09,0.13] [0.82,1.15] [0.13,0.21] [0.07,0.11] σ π,g Uniform (-1,1) [-0.57,-0.07] [-0.86,-0.11] [-0.92,-0.24] [-0.67,0.12] σ π,y Uniform (-1,1) [-0.16,0.40] [-0.16,0.16] [-0.22,0.46] [-0.06,0.46] Non-stationary and stationary part of income is negatively and positively correlated with inflation (σ π,g < 0 and σ π,y > 0) 28 / 42

46 Phillips Correlation for Estimated Income Gap Dependent variable: Inf t U.S. U.K. Germany Japan (59Q2-17Q1) (57Q2-17Q1) (75Q2-17Q1) (75Q2-17Q1) Inf t gap t gap t Note: Variables with ** and * are statistically significant at 1% and 5% level. Phillips correlation is observed for the estimated income gaps (i.e., y t and y t 1 ) except for UK 29 / 42

47 Result: Equilibrium Yield Curve Different level of risk averseness 3 U.S. 3 U.K. 3 Germany 3 Japan α = 100 α = 200 Data The model can replicate upward sloping yield curves even under the Phillips correlation! The equilibrium yield curve is computed by putting estimated g t, y t, ξ t and π t into the model for each country High risk averseness entails steeper equilibrium yield curves 30 / 42

48 Result: Equilibrium Yield Curve Nominal and real yield curve 3 U.S. 3 U.K. 3 Germany 3 Japan Nominal Real Data Real term premiums explain a large part of term premiums It is in contrast with the previous literature, but in line with empirical works (e.g., Abrahams et. al., 2016) 31 / 42

49 Mechanism behind the Equilibrium Yield Curve Difference between stationary and non-stationary income is a key to understanding the equilibrium yield curve 32 / 42

50 Mechanism behind the Equilibrium Yield Curve Difference between stationary and non-stationary income is a key to understanding the equilibrium yield curve The stationary income shock entails the Phillips correlation because σ y,π > 0 and κ > 0 32 / 42

51 Mechanism behind the Equilibrium Yield Curve Difference between stationary and non-stationary income is a key to understanding the equilibrium yield curve The stationary income shock entails the Phillips correlation because σ y,π > 0 and κ > 0 But, under the PIH, consumption growth is more influenced by non-stationary income than stationary one σ g,π < 0 induces corr( c t, π t ) < 0 in the model 32 / 42

52 Mechanism behind the Equilibrium Yield Curve Difference between stationary and non-stationary income is a key to understanding the equilibrium yield curve The stationary income shock entails the Phillips correlation because σ y,π > 0 and κ > 0 But, under the PIH, consumption growth is more influenced by non-stationary income than stationary one σ g,π < 0 induces corr( c t, π t ) < 0 in the model Non-stationarity of supply shock is long well-known in the VAR literature (e.g., Blanchard and Quah, 1989) 32 / 42

53 Mechanism behind the Equilibrium Yield Curve Difference between stationary and non-stationary income is a key to understanding the equilibrium yield curve The stationary income shock entails the Phillips correlation because σ y,π > 0 and κ > 0 But, under the PIH, consumption growth is more influenced by non-stationary income than stationary one σ g,π < 0 induces corr( c t, π t ) < 0 in the model Non-stationarity of supply shock is long well-known in the VAR literature (e.g., Blanchard and Quah, 1989) Positive real term premiums are caused by ϕ π > 1 (i.e., the Taylor principle) Real long-term bond is also a poor hedge against inflation! 32 / 42

54 Monetary Policy Rule and Equilibrium Yield Curve Simulation results under different parameter values 3 U.S. 3 U.K. 3 Germany 3 Japan Baseline (φ π =1.5,φ y =0.25) High φ (φ =2.0,φ =0.25) π π y Data Higher values of ϕ π lead to steeper yield curves. Why? 33 / 42

55 Monetary Policy Rule and Equilibrium Yield Curve Mechanism Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) = E t (Q 1,t+1 )/R t + cov(1/r t+1, M t,t+1 ) cov(1/r t+1, M t,t+1 ) Term premiums 34 / 42

56 Monetary Policy Rule and Equilibrium Yield Curve Mechanism Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) = E t (Q 1,t+1 )/R t + cov(1/r t+1, M t,t+1 ) cov(1/r t+1, M t,t+1 ) Term premiums Comparative statics for ϕ π : High ϕ π cov(1/r t+1, π t+1 ) cov(1/r t+1, c t+1 ) 34 / 42

57 Monetary Policy Rule and Equilibrium Yield Curve Mechanism Let us think about 2-period bond price, Q 2,t Q 2,t = E t (Q 1,t+1 M t,t+1 ) = E t (Q 1,t+1 )/R t + cov(1/r t+1, M t,t+1 ) cov(1/r t+1, M t,t+1 ) Term premiums Comparative statics for ϕ π : High ϕ π cov(1/r t+1, π t+1 ) cov(1/r t+1, c t+1 ) Differences in term structure across countries are possibly explained by differences in monetary policy rules 34 / 42

58 Volatility Curve and Trend Inflation Relative volatility for long-term interest rates Data Baseline Fixed π t 5Y 10Y 5Y 10Y 5Y 10Y U.S U.K Germany Japan Relative volatility of long-term interest rates fit the data well Volatility induced by the trend inflation is a key With fixed trend inflation, volatility of long-term interest rates are much smaller than data (Fuhrer, 1996) 35 / 42

59 Macroeconomic Moments for Consumption Growth U.S. U.K. Germany Japan std( c t ) Model Data corr( c t, y t ) Model Data corr( c t, π t ) Model Data corr( c t 1, c t ) Model Data std( c t ) is too large ( excess smoothness in data) 2. corr( c t, y t ) is too small ( excess sensitivity in data) 36 / 42

60 Rule-of-Thumb Consumers The excess smoothness and sensitivity are commonly observed in the PIH model (e.g., Deaton and Campbell, 1989) 37 / 42

61 Rule-of-Thumb Consumers The excess smoothness and sensitivity are commonly observed in the PIH model (e.g., Deaton and Campbell, 1989) Campbell and Mankiw (1990) point out the existence of the Rule-of-thumb (ROT) consumers 37 / 42

62 Rule-of-Thumb Consumers The excess smoothness and sensitivity are commonly observed in the PIH model (e.g., Deaton and Campbell, 1989) Campbell and Mankiw (1990) point out the existence of the Rule-of-thumb (ROT) consumers With ROT consumers, consumption growth is redefined as: c t = λ c ROT t + (1 λ) c PIH t = λ y t + (1 λ) c PIH t Set λ = 0.25 as in a previous literature 37 / 42

63 Macroeconomic Moments with ROT Consumer U.S. U.K. Germany Japan std( c t ) Baseline With ROT Data corr( c t, y t ) Baseline With ROT Data corr( c t, π t ) Baseline With ROT Data corr( c t 1, c t ) Baseline With ROT Data With ROT consumers, std( c t ) and corr( c t, y t ) fit better 38 / 42

64 The low-for-long Economy The economy with permanently low growth and low inflation is a real risk for advanced economies (c.f., secular stagnation) 39 / 42

65 The low-for-long Economy The economy with permanently low growth and low inflation is a real risk for advanced economies (c.f., secular stagnation) What does the model predict about the term structure in the low-for-long environment? It is important issue for financial stability because the maturity transformation is a key for bank profitability (GFSR, 2017) 39 / 42

66 The low-for-long Economy The economy with permanently low growth and low inflation is a real risk for advanced economies (c.f., secular stagnation) What does the model predict about the term structure in the low-for-long environment? It is important issue for financial stability because the maturity transformation is a key for bank profitability (GFSR, 2017) Conduct counterfactual simulations for the low-for-long by: 1. Setting log(g ) = 0 and log(πt ) = 0 2. Introduce the zero lower bound of nominal interest rate [ ( ) ϕπ ( ) ] 1 ϕr ϕy R t = max 1.0, Rϕ r t 1 πt g Πt Yt πt yt 39 / 42

67 Equilibrium Yield Curve under the Low-for-Long Nominal and real yield curves 2 U.S. 2 U.K. 2 Germany 2 Japan Baseline (nominal) Low-for-long (nominal) Baseline (real) Low-for-long (real) The low-for-long would entail a flatter yield curve in addition to lower level of interest rates Real term premiums decline a lot while inflation premiums are almost unchanged. What is the intuition? 40 / 42

68 Equilibrium Yield Curve under the Low-for-Long Logic behind the flattening under the Low-for-Long Responses of real interest rates to inflation would be changed under the Low-for-Long environment due to the ZLB Above the ZLB: π t R t /π t+1 by Taylor principle Around the ZLB: π t R t /π t+1 due to the ZLB 41 / 42

69 Equilibrium Yield Curve under the Low-for-Long Logic behind the flattening under the Low-for-Long Responses of real interest rates to inflation would be changed under the Low-for-Long environment due to the ZLB Above the ZLB: π t R t /π t+1 by Taylor principle Around the ZLB: π t R t /π t+1 due to the ZLB Hence, the positive correlation between real SDF and real interest rates would be weaken Intuition: Inflation decreases income/consumption growth but increases real bond prices under the low-for-long A long-term bond is insurance rather than a risky asset! 41 / 42

70 Equilibrium Yield Curve under the Low-for-Long Logic behind the flattening under the Low-for-Long Responses of real interest rates to inflation would be changed under the Low-for-Long environment due to the ZLB Above the ZLB: π t R t /π t+1 by Taylor principle Around the ZLB: π t R t /π t+1 due to the ZLB Hence, the positive correlation between real SDF and real interest rates would be weaken Intuition: Inflation decreases income/consumption growth but increases real bond prices under the low-for-long A long-term bond is insurance rather than a risky asset! Bank profitability could face difficulty in the low-for-long 41 / 42

71 Concluding Remarks The model can replicate an upward sloping yield curve even under the Phillips correlation Differences between stationary and non-stationary income is a key to understanding the relationship The low-for-long would entail a flatter yield curve due to a decline in real term premiums around the ZLB Bank profitability could face difficulty in the low-for-long 42 / 42

72 Concluding Remarks The model can replicate an upward sloping yield curve even under the Phillips correlation Differences between stationary and non-stationary income is a key to understanding the relationship The low-for-long would entail a flatter yield curve due to a decline in real term premiums around the ZLB Bank profitability could face difficulty in the low-for-long Future work: How do we rationalize the dynamic relation between income growth and inflation in a general equilibrium framework? What determines the differences in term structure of interest rates across countries? 42 / 42

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