Technology shocks and Monetary Policy: Assessing the Fed s performance
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1 Technology shocks and Monetary Policy: Assessing the Fed s performance (J.Gali et al., JME 2003) Miguel Angel Alcobendas, Laura Desplans, Dong Hee Joe March 5, 2010 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
2 Contents 1 Introduction 2 Baseline model 3 Monetary rules 4 Comparison: Empirical evidence VS Simulation 5 Conclusion M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
3 Introduction: Three famous chiarmans of the Fed We only know three chiarmans of the Fed M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
4 Introduction: Three famous chiarmans of the Fed We only know three chiarmans of the Fed Ben S. Bernanke ( now) Very famous economist TV star during the financial crisis M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
5 Introduction: Three famous chiarmans of the Fed We only know three chiarmans of the Fed Ben S. Bernanke ( now) Very famous economist TV star during the financial crisis Alan Greenspan ( ) The Maestro of the economy The Age of Turbulence M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
6 Introduction: Three famous chiarmans of the Fed We only know three chiarmans of the Fed Ben S. Bernanke ( now) Very famous economist TV star during the financial crisis Alan Greenspan ( ) The Maestro of the economy The Age of Turbulence Paul A. Volcker ( ) Second oil shock Typical Hawkish M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
7 Introduction: Main Question Main question of the paper How well does the Fed do its job? M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
8 Introduction: Main Question Main question of the paper How well does the Fed do its job? What is the Fed s job? M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
9 Introduction: Main Question Main question of the paper How well does the Fed do its job? What is the Fed s job? The Federal Reserve Act says...to promote maximum sustainable output and employment and to promote stable prices M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
10 Introduction: How well the Fed does its job To answer how well the Fed does its job, the paper M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
11 Introduction: How well the Fed does its job To answer how well the Fed does its job, the paper identifies technology shock as the only source of the unit root in labor productivity M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
12 Introduction: How well the Fed does its job To answer how well the Fed does its job, the paper identifies technology shock as the only source of the unit root in labor productivity characterizes the Fed s systematic response to technology shocks and its implications for U.S. output, hours and inflation based on a structural VAR model M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
13 Introduction: How well the Fed does its job To answer how well the Fed does its job, the paper identifies technology shock as the only source of the unit root in labor productivity characterizes the Fed s systematic response to technology shocks and its implications for U.S. output, hours and inflation based on a structural VAR model compares the empirical responses to the simulated ones from three simple monetary policies in the context of a standard business cycle model with sticky prices 1 optimal policy: one that fully stabilizes prices 2 simple Taylor rule 3 monetary targeting rule M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
14 Baseline model: A New Keynesian model A simple version of the Calvo(1983) model with sticky prices M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
15 Baseline model: A New Keynesian model A simple version of the Calvo(1983) model with sticky prices Key feature of New Keynesian model: Nominal rigidities M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
16 Baseline model: A New Keynesian model A simple version of the Calvo(1983) model with sticky prices Key feature of New Keynesian model: Nominal rigidities Representative household, continuum of firms (i [0, 1]), monetary policy M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
17 Baseline model: A New Keynesian model A simple version of the Calvo(1983) model with sticky prices Key feature of New Keynesian model: Nominal rigidities Representative household, continuum of firms (i [0, 1]), monetary policy Two key features of the baseline model 1 imperfect competition: differentiated goods, i.e. firms set their prices 2 sticky prices: only a fraction of firms can reset their prices in any given period M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
18 Baseline model: Household Infinitely lived representative household solving 1 max E 0 t=0 β t ( C t 1 σ 1 σ N1+ϕ t 1 + ϕ ) subject to 0 P t (i)c t (i)di + Q t B t B t 1 + W t N t lim E tb T 0 T where C t ( 1 0 C t(i) 1 1 ɛ di) ɛ ɛ 1 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
19 Baseline model: Household P t (i): price of good i at t P t ( 1 0 P t(i) 1 ɛ di) 1 1 ɛ : aggregate price index at t C t (i): amount consumed of good i at t C t : aggregate consumption index as previously defined B t : quantity of 1 period risk-free discount bonds purchased at t Q t : its price at t W t : nominal wage (per hour) at t N t : hours worked at t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
20 Baseline model: Household optimization Solving the problem and taking the log, we get the labor supply schedule w t p t = σc t + ϕn t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
21 Baseline model: Household optimization Solving the problem and taking the log, we get the labor supply schedule w t p t = σc t + ϕn t Letting r t logq t, rr logβ and taking the first-order Taylor expansion, we also get the log-linearized Euler equation c t = 1 σ (r t E t π t+1 rr) + E t c t+1 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
22 Baseline model: Household optimization Solving the problem and taking the log, we get the labor supply schedule w t p t = σc t + ϕn t Letting r t logq t, rr logβ and taking the first-order Taylor expansion, we also get the log-linearized Euler equation c t = 1 σ (r t E t π t+1 rr) + E t c t+1 and from the clearing of each market i (Y t (i) = C t (i), so Y t = C t ), we get y t = 1 σ (r t E t π t+1 rr) + E t y t+1 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
23 Baseline model: Firm Continuum of firms each producing a differentiated good with technology Y t (i) = A t N t (i), i [0, 1] with a loga t following a t = ρ a t 1 + ɛ t where ρ [0, 1) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
24 Baseline model: Firm Continuum of firms each producing a differentiated good with technology Y t (i) = A t N t (i), i [0, 1] with a loga t following Assumptions a t = ρ a t 1 + ɛ t where ρ [0, 1) 1 variations in aggregate productivity are the only sources of fluctuations 2 no capital accumulation (most results and implications not affected) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
25 Baseline model: Firm s profit maximization under flexible prices Firms put markup on marginal cost to maximize profits MC t = real marginal cost at t = real wage/marginal product = Wt P ta t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
26 Baseline model: Firm s profit maximization under flexible prices Firms put markup on marginal cost to maximize profits MC t = real marginal cost at t = real wage/marginal product = Wt P ta t combined with labor supply and good market clearings the common marginal cost for all firms mc t = (σ + ϕ)y t (1 + ϕ)a t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
27 Baseline model: Firm s profit maximization under flexible prices Firms put markup on marginal cost to maximize profits MC t = real marginal cost at t = real wage/marginal product = Wt P ta t combined with labor supply and good market clearings the common marginal cost for all firms mc t = (σ + ϕ)y t (1 + ϕ)a t same CRS technology, same isoelastic demand, same real marginal cost across all firms Y t (i) = A t N t (i), C t (i) = ( P t(i) ) ɛ C t P t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
28 Baseline model: Firm s profit maximization under flexible prices Firms put markup on marginal cost to maximize profits MC t = real marginal cost at t = real wage/marginal product = Wt P ta t combined with labor supply and good market clearings the common marginal cost for all firms mc t = (σ + ϕ)y t (1 + ϕ)a t same CRS technology, same isoelastic demand, same real marginal cost across all firms Y t (i) = A t N t (i), C t (i) = ( P t(i) ) ɛ C t P t under flexible prices, the markup is common across all firms, given by ɛ/(ɛ 1) and mc t = log ɛ/(ɛ 1) = mc (not depending on t) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
29 Baseline model: Equilibrium under flexible prices Call the equilibrium processes under flexible prices Natural levels M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
30 Baseline model: Equilibrium under flexible prices Call the equilibrium processes under flexible prices Natural levels Natural level of output yt = γ + ψa t where ψ (1 + ϕ)/(σ + ϕ), γ mc/(σ + ϕ) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
31 Baseline model: Equilibrium under flexible prices Call the equilibrium processes under flexible prices Natural levels Natural level of output yt = γ + ψa t where ψ (1 + ϕ)/(σ + ϕ), γ mc/(σ + ϕ) Natural level of employment nt = γ + (ψ 1)a t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
32 Baseline model: Equilibrium under flexible prices Call the equilibrium processes under flexible prices Natural levels Natural level of output yt = γ + ψa t where ψ (1 + ϕ)/(σ + ϕ), γ mc/(σ + ϕ) Natural level of employment nt = γ + (ψ 1)a t Natural rate of real interest rate rr t = rr + σρψ a t where rr t : real interest rate at t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
33 Baseline model: under sticky prices Assumption: Pr i,t (reset its price in this period) = 1-θ M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
34 Baseline model: under sticky prices Assumption: Pr i,t (reset its price in this period) = 1-θ the markup and the real marginal cost will no longer be constant and output gap (x t y t y t ) may emerge M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
35 Baseline model: under sticky prices Assumption: Pr i,t (reset its price in this period) = 1-θ the markup and the real marginal cost will no longer be constant and output gap (x t y t y t ) may emerge Then we can derive the new Phillips curve π t = βe t π t+1 + kx t, k (1 θ)(1 βθ)(σ + ϕ) θ M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
36 Baseline model: under sticky prices Assumption: Pr i,t (reset its price in this period) = 1-θ the markup and the real marginal cost will no longer be constant and output gap (x t y t y t ) may emerge Then we can derive the new Phillips curve π t = βe t π t+1 + kx t, k (1 θ)(1 βθ)(σ + ϕ) θ and y t = 1 σ (r t E t π t+1 rr) + E t y t+1 can be rewritten as x t = 1 σ (r t E t π t+1 rr t ) + E t x t+1 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
37 The Basic New Keynesian Model New Keynesian Phillips curve π t = βe t {π t+1 } + κx t Dynamic IS Equation x t = ( 1 σ )(r t E t {π t+1 } rr ) + E t {x t+1 } Monetary Policy Rule M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
38 Dynamics effects of technology shocks Alternative specifications of the systematic component of monetary policy that will try to lead us to the optimal allocation: A simple Taylor rule Constant money growth How the nature of the monetary policy affects the equilibrium responses of different variables to a permanent shock to technology? M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
39 Optimal monetary policy Aim of monetary policy: to replicate the allocation associated with the flexible price equilibrium. The optimal policy requires that x t = π t = 0, for all t. Flexible price equilibrium replicated with the following interest rule: r t = rr + σρψ a t + ø π π t for any φ π > 1 The equilibrium response of output and unemployment will match that of their natural levels M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
40 Optimal monetary policy The sign of the response of employment depends on the size of σ (1/σ: intertemporal elasticity of substitution between consumption in 2 periods) E 0 β t ( C t 1 σ 1 σ N1+ϕ t 1+ϕ ) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
41 Optimal monetary policy M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
42 A simple Taylor rule The central bank follows the rule: r t = rr + ø π π t + ø x x t Calibration ø π = 1.5 ø x = 0 σ = 1 β = 0.99 ϕ = 1 ρ = 0.2 θ = 0.75 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
43 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
44 A monetary targeting rule m t m t 1 = Λ m Without loss of generality assume Λ m = 0, which is consistent with zero inflation in the steady state. The demand for money is assumed to be m t p t = y t ηr t Letting mt m t p t ψa t mt = x t ηr t mt 1 = m t + π t + ψ a t r t = rr + ( σ 1 1+η ) ( η 1+η )κ 1 E t { y t+κ } M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
45 M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
46 The Fed s response to technology shocks:evidence Evidence on the Fed s systematic response to technology shocks and its implications for U.S. output, hours and inflation. Are those responses consistent with any of the rules considered in the previous section? Sample period 1954:I-1998:III. Pre-Volcker Period (1954:I-1979:II) - Volcker-Greenspan Period(1982:III-1998:III). The empirical effects of technology shocks are determined through the estimation of a structural VAR. M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
47 The Fed s response to technology shocks:evidence Pre-Volcker vs Volcker-Greenspan Era Clarida, Gaĺı and Gertler, QJE 2000 Estimation of a forward-looking monetary policy reaction function for the post-war US economy. (1954:I-1998:III) Results Differences in estimated rule across across periods Volcker-Greenspan (1982:III-1998:III) interest rate policy more sensitive to changes in expected inflation than in the Pre-Volcker era (1954:I-1979:II) The Volcker-Greenspan rule is stabilizing over the equilibrium properties of inflation and output M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
48 The Fed s response to technology shocks:evidence Identification and Estimation We are considering a structural VAR(4) with four variables. Only interested in exogenous variations in technology. Productivity t Y t = π t hours t real interest rate t Y t = F 1 Y t 1 + F 2 Y t 2 + F 3 Y t 3 + F 4 Y t 4 + E t Identification restriction: Only technology shocks may have a permanent effect on the level of labor productivity (Gali AER 1999) Productivity t = z t + ζ t (K t, L t, Z t, U t, N t ) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
49 The Fed s response to technology shocks:evidence Identification and Estimation M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
50 The Fed s response to technology shocks:evidence The Volcker-Greenspan Era 1982:III-1998:III Estimated response to a positive technological shock (sd = 1) vs Impulse response under optimal policy. Optimal Policy: x t = π t = 0 ρ = 0, a t = ρ a t 1 + ɛ t, yt = γ + ( ) nt = γ + 1+ϕ 1 a σ+ϕ t, rrt = rr + σρ ( 1+ϕ σ+ϕ ( 1+ϕ σ+ϕ ) a t ) a t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
51 The Fed s response to technology shocks:evidence The Volcker-Greenspan Era 1982:III-1998:III M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
52 Volcker-Greenspan period consistent with the optimal policy M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34 The Fed s response to technology shocks:evidence The Volcker-Greenspan Era 1982:III-1998:III Both hours and inflation response functions are not significant
53 The Fed s response to technology shocks:evidence The Pre-Volcker Period (1954:I-1979:II) Estimated response to a positive technological shock (sd = 1) vs Impulse response under optimal policy. Optimal Policy: x t = π t = 0 ρ = 0.7, a t = ρ a t 1 + ɛ t, yt = γ + ( ) nt = γ + 1+ϕ 1 a σ+ϕ t, rrt = rr + σρ ) ( 1+ϕ σ+ϕ ( 1+ϕ σ+ϕ a t ) a t M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
54 The Fed s response to technology shocks:evidence The Pre-Volcker Period (1954:I-1979:II) M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
55 The Fed s response to technology shocks:evidence The Pre-Volcker Period (1954:I-1979:II) Both hours and inflation response functions deviate from optimal path Pre-Volcker period is not consistent with the optimal policy M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
56 The Fed s response to technology shocks:evidence The Pre-Volcker Period vs Monetary Targeting Rule M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
57 Conclusions Analysis of the Fed s response to technology shocks and its implications for U.S. output, hours and inflation. Consistency of the Fed s (Volcker-Greenspan period) response to a technology shock with a rule that seeks to stabilize prices and the output gap. The Fed s policy in Pre-Volcker period tended to overstabilize output thus generating excess volatility in inflation. M.A.Alcobendas, L. Desplans, D.H.Joe () TSE March 5, / 34
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