Inflation in the Great Recession and New Keynesian Models
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1 Inflation in the Great Recession and New Keynesian Models Marco Del Negro, Marc Giannoni Federal Reserve Bank of New York Frank Schorfheide University of Pennsylvania BU / FRB of Boston Conference on Macro-Finance Linkages October 5, 3 Disclaimer: The views expressed here do not necessarily reflect those of the Federal Reserve Bank of New York or the Federal Reserve System
2 Have NK DSGE Models Failed? Great Recession saw a very large drop in economic activity but only a modest decline in inflation Can New Keynesian models explain inflation in the Great Recession? Hall (AER ): The dominant model of inflation embedded in practical macro models today... cannot explain the stabilization of inflation at positive rates in the presence of long-lasting slack. Ball and Mazumder (BPEA ): A puzzle emerges when Phillips curves estimated over 96-7 are used to predict inflation over 8-: inflation should have fallen by more than it did... the Great Recession provides fresh evidence against the New Keynesian Phillips curve... Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
3 Have NK DSGE Models Failed? Can New Keynesian models explain inflation at all? King and Watson ():... we find that fundamental inflation behaves very different from actual inflation. This decomposition suggests that inflation control would be more problematic, as inflation is dominated by shocks to the NKPE within the SW model. Conclude that SW model can explain the behavior of inflation only when assuming large exogenous markup shocks, which are difficult to interpret Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 3 / 58
4 This Paper Uses a standard DSGE model available prior to recent crisis Model: Smets and Wouters (7) extended to include financial frictions as in Bernanke, Gertler and Gilchrist (999) and Christiano, Motto and Rostagno (3+)... estimated with data up to 8-Q3 (pre-lehman) Shows out-of-sample forecasts after 8 3 Attempts to explain the joint behavior of inflation and output Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 4 / 58
5 Key Findings As soon as financial stress (credit spreads) jumps in fall of 8, the model successfully predicts the broad contours of Great Recession, out of sample: Sharp contraction in activity Modest and protracted decline in inflation Why is the decline in inflation so small given the large output gap? Prices are sticky Inflation depends more on expected future mc than current mc Even if current activity is sharply reduced, monetary policy stimulus raises expected future mc, so that inflation expectations remain anchored 3 In contrast to King-Watson: inflation is mainly explained by expected future marginal costs and not by exogenous markup shocks Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 5 / 58
6 DSGE Model Outline Smets-Wouters model Incorporating financial frictions DSGE Forecasts of the Great Recession 3 Inflation and Fundamental Inflation 4 Importance of Financial Frictions 5 Is Policy Irrelevant? 6 Conclusion Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 6 / 58
7 Baseline DSGE Model: SW (7) Stochastic growth model +... real rigidites nominal rigidites investment adjustment costs price stickiness (ζ p ) variable capital utilization wage stickiness (ζ w ) + habit persistence partial indexation to lagged inflation 7 shocks: Neutral technology, investment specific technology, price and wage mark-up, discount rate, government spending, monetary policy. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 7 / 58
8 Baseline DSGE Model: SW (7) Measurement equation: Output growth = LN((GDPC)/LNSINDEX ) Consumption growth = LN((PCEC/GDPDEF )/LNSINDEX ) Investment growth = LN((FPI /GDPDEF )/LNSINDEX ) Real Wage growth = LN(PRS8563/GDPDEF ) Hours = LN((PRS8563 CE 6OV /)/LNSINDEX ) Inflation = LN(GDPDEF /GDPDEF ( )) FFR = FEDERAL FUNDS RATE/4 Sample starts in 964:Q Bayesian estimation Same prior on θ as SW Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 8 / 58
9 Incorporating -yrs Inflation Expectations from Surveys SW forecasts inflation well but impose tight prior on π We use a loose prior on π and survey data: [ ] πt O,4 = π 4 + IE t π t+k 4 k=... and change the model to be able to explain it: R t = ρ R R t + ( ρ R ) ( ψ (π t πt ) + ψ (y t yt f ) ) ( +ψ 3 (yt yt f ) (y t yt ) f ) + rt m, where πt = ρ π πt + σ π ɛ π,t. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 9 / 58
10 Incorporating Financial Frictions (SW-FF) SW: arbitrage condition between return on capital and return on nominal bond: E t [ R k t+] = R t + b t, where b t is a shock ( spread / discount ). SW-FF: arbitrage condition is E t [ R t+] k ( = R t + b t +ζ sp,b q k t + k ) t n t }{{} leverage + σ ω,t where σ ω,t is an additional shock, and n t is an additional endogenous variable. and R k t R t is treated as observed: IE t [ R k t+ R t ] = (Baa Corp. rate - y Treas. yield)/4 Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
11 DSGE Model Outline Smets-Wouters model Incorporating financial frictions DSGE Forecasts of the Great Recession 3 Inflation and Fundamental Inflation 4 Importance of Financial Frictions 5 Is Policy Irrelevant? 6 Conclusion Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
12 Forecasting the Great Recession: 8Q3 Data SW SW-FF SW-FF + 8Q4 FFR,Spr Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
13 Output Growth, Cumulative Output and Output Gap (SW-FF) Output Cumulative Gap Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 3 / 58
14 Forecasting the Great Recession As soon as credit spread jump, in October 8, DSGE (SWπ-FF) forecasts severity and persistence of the great recession, and subsequent recovery Model roughly captures cumulative output 3 Model forecasts a large and persistent output gap (output minus output under flex prices/wages and no mark-up shocks): about -7% 4 What happens to inflation? Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 4 / 58
15 Inflation. Inflation (Q/Q). 6 Log Prices Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 5 / 58
16 Forecasting the Great Recession and Inflation Model captures broad contour of inflation evolution... misses in 9- largely affected by energy prices Contrary to Hall () and Ball-Mazumder () s conjecture: Phillips curve in model does not imply large negative inflation forecasts! But how can we reconcile large drop in activity and small drop in inflation? What happens to marginal costs? Marginal costs = latent variable in the model; related but not equal to labor share Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 6 / 58
17 Marginal Costs Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 7 / 58
18 Inflation and Marginal Costs: Bad News? Model fails to predict realized path of (smoothed) marginal cost, post-8 Had we correctly forecast the low values of marginal costs, would we have seen a large deflation? Are the forecasts of future marginal costs unreasonable? Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 8 / 58
19 Inflation Forecast Conditional on ex post mc t (red) vs. Backward-Looking PC conditional on u t (blue) Notes: Forecast conditional on realized marginal cost (red) and Stock-Watson reduced-form Philips curve (blue dash). Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 9 / 58
20 What is going on? It is not the current slack in the economy, i.e., the current value of mc t that matters for inflation, but the projected path for slack The more marginal costs differ from steady state, the faster the projections revert to steady state definition of anchoring inflation expectations In a backward-looking (e.g., Stock-Watson s) Phillips curve that uses current and lagged unemployment rate, inflation would have been much lower. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
21 8 6 Current and Expected Future mc t Marginal Cost Data Forecast Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
22 What is going on? It is not the current slack in the economy, i.e., the current value of mc t that matters for inflation, but the projected path for slack The more marginal costs differ from steady state, the faster the projections revert to steady state definition of anchoring inflation expectations In a backward-looking (e.g., Stock-Watson s) Phillips curve that uses current and lagged unemployment rate, inflation would have been much lower. Are the model s implied mc forecasts bad? Not worse than those from reduced form models! Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS / 58
23 DSGE Model Outline Smets-Wouters model Incorporating financial frictions DSGE Forecasts of the Great Recession 3 Inflation and Fundamental Inflation 4 Importance of Financial Frictions 5 Is Policy Irrelevant? 6 Conclusion Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 3 / 58
24 Inflation and Fundamental Inflation NKPC implies: or π t = ( ι p L) j=o β j ( + ι p β)ie t [κmc ˆ t+j + ˆλ f,t+j ] π t = π t + Λ f,t Fundamental inflation: π t = κ ( ι p L) ( + ι p β) β j IE t [mc t+j ] PDV. markup shocks: j=o }{{} PDV marginal costs Λ f,t = ( ι p L) ( + ι p β) β j IE t [ˆλ f,t+j ] j=o Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 4 / 58
25 King and Watson () Decompose inflation into fundamental inflation and the residual Λ f,t, using the SW model Find that fundamental inflation behaves very differently from actual inflation; i.e., fluctuations in actual inflation are largely due to markup shocks SW model fails to explain the behavior of inflation! KW/SW fundamental inflation falls dramatically since 7: Based it inflation would be around -% annulized since 7, in the absence of markup shocks Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 5 / 58
26 Inflation and Fundamental Inflation 4 3 Fund. Infl. SW Fund. Infl. GDPDEF Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 6 / 58
27 Two Questions Why the difference between π t in SW and SW-FF model? Answer: Relatively low price rigidities in SW model imply that fundamental inflation current marginal cost inflation Why does the SW-FF model have higher price rigidities? Answer: Because demand shocks are more important since spreads are observable. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 7 / 58
28 Price Rigidities and Fundamental Inflation Key difference: Price rigidities (ζ p ) stronger in SW-FF (.86) than in SW model (.65) π t = κ ( ι p L) ( + ι p β) β j IE t [mc t+j ] Fundamental inflation responds less to a given movement in expected future mc t (lower NKPC slope κ) With low price rigidities Since j=o β j IE t [mc t+j ] current mc t j=o current mc t inflation need markup shocks to explain inflation Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 8 / 58
29 Price Rigidities and Forecasts of Marginal Costs mc future mc future mc94 w SW ζ p Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 9 / 58
30 SW Fundamental Inflation vs Marginal Costs.5 SW Fund. Infl. SW mc Both SW fundamental inflation and marginal costs are normalized. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 3 / 58
31 DSGE Model Outline Smets-Wouters model Incorporating financial frictions DSGE Forecasts of the Great Recession 3 Inflation and Fundamental Inflation 4 Importance of Financial Frictions 5 Is Policy Irrelevant? 6 Conclusion Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 3 / 58
32 Why Does the Financial Frictions Model Have Higher Price Rigidities? Demand shocks are more important in the SW-FF model relative to SW because spreads are used as an observable (direct measure of demand shocks) To explain jointly inflation and output data in presence of demand shocks, must have either: flat NKPC (high ζ p ), or markup shock every time there is a spread shock... but estimation does not like correlated shocks! Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 3 / 58
33 Demand Shocks and the Slope of the Phillips Curve Low rigidities High rigidities π π AD PC (low price rigidi/es) AD AD Demand shock AD Demand shock PC (high price rigidi/es) π π π π Cost push shock y y y y y y Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 33 / 58
34 The Evidence Estimating the SW model (up to 8Q3), using in addition spread data and add a spread shock in arbitrage condition: E t [ R k t+] R t = b t + σ ω,t results in higher estimated price rigidity: ζ p =.8 SW model: ζ p =.65 SW-FF model: ζ p =.86 If we decompose inflation into ) a component due to mark-up shocks and ) a component due to demand shocks (discount rate and MEI shocks) we find that the correlation is -.37 for SW, and.8 for SW-FF. 3 Estimates of price rigidities jump up (in both SW-FF and SW) after the crisis. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 34 / 58
35 ζ p : Recursive Estimation SW SW-FF.9.85 Mode Mean 9% Bands.95 Mode Mean 9% Bands Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 35 / 58
36 DSGE Model Outline Smets-Wouters model Incorporating financial frictions DSGE Forecasts of the Great Recession 3 Inflation and Fundamental Inflation 4 Importance of Financial Frictions 5 Is Policy Irrelevant? 6 Conclusion Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 36 / 58
37 Is Policy Irrelevant? The slope of the NKPC κ which determines the extent to which inflation depends on activity is smaller in SW-FF due to higher estimated price rigidity Does a flatter PC mean that ) inflation is nearly exogenous (as in Hall, )? And hence that ) monetary policy looses its ability to stabilize inflation? Answer: No and No. Changes in the systematic FFR response to inflation fluctuations has considerable effects on fundamental inflation. The effect works through expected future marginal costs. Note that even a standard Taylor rule has an Eggertsson-Woodford flavor: stabilizing inflation means promising stronger economic activity in the future. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 37 / 58
38 Forecasts of mc t with Different Policy Coefficients ψ = ψ = mc future mc future mc ψ = mc future mc future mc ψ = Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 38 / 58
39 Counterfactual π t s with Different Policy Coefficients fund. infl. fund. infl. w/ ψ =. fund. infl. w/ ψ = Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 39 / 58
40 DSGE Model Outline Smets-Wouters model Incorporating financial frictions DSGE Forecasts of the Great Recession 3 Inflation and Fundamental Inflation 4 Importance of Financial Frictions 5 Is Policy Irrelevant? 6 Conclusion Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 4 / 58
41 Conclusion As soon as financial stress (credit spreads) jumps in fall of 8, the model SW-FF successfully predicts the broad contours of Great Recession, out-of-sample: Sharp contraction in activity Modest and protracted decline in inflation Why has inflation declined so little? Evidence that prices are sticky Inflation depends more on expected future mc than current mc even if current activity is sharply reduced, monetary policy stimulus raises expected future mc, so that inflation expectations remain anchored Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 4 / 58
42 Conclusion (cont.) 3 With higher price rigidities (in SW-FF model) inflation is mainly explained by expected future mc and not by exogenous markup shocks Contrasts with King-Watson: with more flexible price (SW model), markup shocks are key drivers of inflation 4 Why does the financial frictions model have higher price stickiness? Because observing spreads makes demand shocks more important (spread movements shift the AD curve) make a steep NKPC curve counterfactual. 5 Does a flatter PC mean that monetary policy looses its ability to stabilize inflation? No Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 4 / 58
43 Extra Slides EXTRA SLIDES... Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 43 / 58
44 Extra Slides DSGE Forecasts of the Great Recession Output Inflation FFR Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 44 / 58
45 Extra Slides Contribution of Policy (orange bars); FRBNY-DSGE model Percent Q to Q Annualized Output Growth (deviations from mean) Core PCE Inflation (deviations from mean) Percent Q to Q Annualized Interest Rate (deviations from mean) Percent Q to Q Annualized Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 45 / 58
46 Extra Slides Are DSGE Forecasts of mc Unreasonable? RMSE DSGE AR() recursive Random Walk h step ahead forecast RMSE of forecasts of marginal costs in the SW-FF model (DSGE), an AR() model estimated recursively on past marginal cost data, and a random walk model, for the period 989Q4-Q3. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 46 / 58
47 Extra Slides Our Fundamental Inflation vs Fundamental Inflation using SW Price Rigidities in the Evolution of Marginal Costs.5 fund. inf. fund. inf. w TTT using SW ζ p Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 47 / 58
48 Extra Slides Movements in Fundamental Inflation π t Attributable to Mark-up Shocks 3 SW Fund. Infl..5 SW-FF Fund. Infl Data Markup Data Markup Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 48 / 58
49 Figure Extra Slides : Two Measures of Real Unit Labor Cost in the Extended Sample KW: Marginal costs Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 49 / 58
50 Extra Slides Inflation, Fundamental Inflation, Counterfactual Inflation without Mark-up Shocks, and Core Inflation Fund. Infl. GDPDEF GDPDEF markup CPCE Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 5 / 58
51 Extra Slides Effect of Markup Shocks. Inflation Log Prices Marginal Costs Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 5 / 58
52 Extra Slides Observables or frictions? SWπ-FF s forecasts: Do the financial frictions/cross-equation restrictions play any role, or is it all in the new observable (spreads)? Two exercises: Take states from SW+FF and stick them into plain SW transmission Estimate a Minnesota prior VAR using the same variables as SW-FF up to 8Q3 (level), and condition on 8Q4 interest rates and spreads Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 5 / 58
53 Extra Slides SWπ-FF vs SWπ Output Inflation FFR Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 53 / 58
54 Extra Slides SWπ-FF vs VAR Output Inflation FFR Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 54 / 58
55 Extra Slides What if the Fed had done something different? The estimated rule in SW is: R t =.675 R t + (.675)(.37 (π t π t ) +.5 (y t y f t )) +.5 (y t y f t ) + r m t, This rule places a small weight on the level of the output gap. What if the Fed had targeted labor market conditions (which is arguably doing now) from the beginning: R t =.675 R t + (.675)(.37 (π t π t ) +. L t ) + r m t, where L t is (per capita) hours in deviation from st. st. This model does predict the severity of the recession (and the sluggish recovery) This puts it in a position to give an interesting answer to this question. Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 55 / 58
56 Extra Slides Alternative rule (response to labor market conditions) Output Gap Inflation FFR Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 56 / 58
57 Extra Slides DSGE Output Forecast of the Great Recession: Conditional (red), Unconditional (red dashed), Unconditional + ex post Demand Shocks (blue) Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 57 / 58
58 Extra Slides Entrepreneurs Net Worth and Leverage Entrepreneurs Net Worth Leverage Del Negro, Giannoni, Schorfheide Inflation in the Great Recession BU/FRBBOS 58 / 58
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