Investigating inflation persistence across monetary regimes

Under inflation targeting inflation exhibits negative serial correlation in the United Kingdom, and little or no persistence in Canada, Sweden and New Zealand, and estimates of the indexation parameter in hybrid New Keynesian Phillips curves are either equal to zero, or very low, in all countries. Analogous results hold for the Euro area–and for France, Germany, and Italy–under European Monetary Union; for Switzerland under the new monetary regime; and for the United States, the United Kingdom and Sweden under the Gold Standard: under stable monetary regimes with clearly defined nominal anchors, inflation appears to be (nearly) purely forward-looking, so that no mechanism introducing backward-looking components is necessary to fit the data. These results question the notion that the intrinsic inflation persistence found in post-WWII U.S. data–captured, in hybrid New Keynesian Phillips curves, by a significant extent of backward-looking indexation–is structural in the sense of Lucas (1976), and suggest that building inflation persistence into macroeconomic models as a structural feature is potentially misleading. JEL Classification: E31, E42, E47, E52, E58European Monetary Union, Gold Standard, inflation, inflation targeting, Lucas Critique, Markov chain Monte Carlo, median-unbiased estimation

Monetary Rules, Indeterminacy, and the Business-Cycle Stylised Facts

Several papers have documented how the reaction function of the U.S. monetary authority has been passive, and destabilising, before Volcker"s appointment, and active and stabilising since then. In this paper we first compare the two sub-periods in terms of several key business-cycle 'stylised facts'. The latter period appears to be characterised by a lower inflation persistence; a smaller volatility of reduced-form innovations to both inflation and real GDP growth; and a systematically smaller amplitude of business-cycle frequency fluctuations. Working with the Smets-Wouters (2003) sticky-price, sticky-wage DSGE model of the U.S. economy, we then investigate how such stylised facts change systematically with changes in the parameters of a simple forward-looking monetary rule. We solve the model under indeterminacy via the procedure introduced by Lubik and Schorfheide (2003). The determinacy and indeteminacy regions appear to be characterised by markedly different sets of stylised facts. In several cases the relationship between the parameters of the monetary rule and key stylised facts under indeterminacy is a mirror image of what it is under determinacy: both inflation persistence and the volatility of its reduced-form innovations, for example, are increasing in the coefficient on inflation under indeterminacy, decreasing under determinacy. We finally compare the facts identified in the data with those generated by the model conditional on estimated monetary rules.monetary policy rules; indeterminacy; business cycles; frequency domain; median-unbiased estimation.

Evolving Phillips trade-off

We characterise the evolution of the U.S. unemployment-inflation trade-off since the late XIX century era via a Bayesian time-varying parameters structural VAR. The Great Inflation episode appears as historically unique along several dimensions. In particular, the shape of the ‘Phillips loop’–which is defined in terms of the impulse-response functions of inflation and unemployment’s deviations from equilibrium–was, during those years, clearly out of line with respect to the rest of the sample period for all structural innovations except money demand shocks. During the Great Depression, on the other hand, the Phillips trade-off did not exhibit any peculiar qualitative feature, so that, when seen through these lenses, the 1930s only stand out because of the sheer size of the macroeconomic fluctuation. The historical evolution of the Phillips trade-off exhibits virtually no connection with the evolution of the extent of trade openness of the U.S. economy. Although, by itself, this does not rule out a possible impact of globalisation on the slope of the trade-off in recent years, it clearly suggests that, historically, the evolution of the trade-off has been dominated by factors other than trade openness. JEL Classification: E30, E32Bayesian VARs, Globalisation, Great Depression, Great Inflation, identified VARs, Lucas Critique, Phillips trade-off, stochastic volatility, time-varying parameters

Are 'intrinsic inflation persistence' models structural in the sense of Lucas (1976)?

Following Fuhrer and Moore (1995), several authors have proposed alternative mechanisms to ‘hardwire’ inflation persistence into macroeconomic models, thus making it structural in the sense of Lucas (1976). Drawing on the experience of the European Monetary Union, of inflation-targeting countries, and of the new Swiss monetary policy regime, I show that, in the Phillips curve models proposed by Fuhrer and Moore (1995), Gali and Gertler (1999), Blanchard and Gali (2007), and Sheedy (2007), the parameters encoding the ‘intrinsic’ component of inflation persistence are not invariant across monetary policy regimes, and under the more recent, stable regimes they are often estimated to be (close to) zero. In line with Cogley and Sbordone(2008), I explore the possibility that the intrinsic component of persistence many researchers have estimated in U.S. post-WWII inflation may result from failure to control for shifts in trend inflation. Evidence from the Euro area, Switzerland, and five inflation-targeting countries is compatible with such hypothesis. JEL Classification: E30, E32Bayesian estimation, Inflation persistence, New Keynesian models

U.S. evolving macroeconomic dynamics: a structural investigation

We fit a Bayesian time-varying parameters structural VAR with stochastic volatility to the Federal Funds rate, GDP deflator inflation, real GDP growth, and the rate of growth of M2. We identify 4 shocks–monetary policy, demand non-policy, supply, and money demand–by imposing sign restrictions on the estimated reduced-form VAR on a period-by-period basis. The evolution of the monetary rule in the structural VAR accords well with narrative accounts of post-WWII U.S. economic history, with (e.g.) significant increases in the long-run coefficients on inflation and money growth around the time of the Volcker disinflation. Overall, however, our evidence points towards a dominant role played by good luck in fostering the more stable macroeconomic environment of the last two decades. First, the Great Inflation was due, to a dominant extent, to large demand non-policy shocks, and to a lower extent to supply shocks. Second, imposing either Volcker or Greenspan over the entire sample period would only have had a limited impact on the Great Inflation episode, while imposing Burns and Miller would have resulted in a counterfactual inflation path remarkably close to the actual historical one. Although the systematic component of monetary policy clearly appears to have improved over the sample period, this does not appear to have been the dominant influence in post-WWII U.S. macroeconomic dynamics. JEL Classification: E32, E47, E52, E58Bayesian VARs, frequency domain, Great Inflation, identified VARs, Lucas critique, stochastic volatility, time-varying parameters

The Great Moderation and the ‘Bernanke Conjecture’

Was the Great Moderation in the United States due to good policy or good luck? Taking, as data generation process, a New Keynesian sticky-price model in which the only source of change is the move from a passive to an active monetary rule, we show how standard econometric methods, both reducedform and structural, often misinterpret good policy for good luck. Specifically, we show how such a move is perfectly compatible with: (a) little change in the estimated impulse-response functions to a monetary policy shock, as in Stock and Watson (2002), Primiceri (2005), Canova and Gambetti (2005), and Gambetti, Pappa, and Canova (2006). (b) Significant changes in the estimated volatilities of both reduced-form and structural shocks–as in (e.g.) Ahmed, Levin, and Wilson (2004) and Stock and Watson (2002)–even in the absence, by construction, of any change in the volatilities of structural innovations. (c) Little change in the integrated normalised spectra of inflation and GDP growth at the business-cycle frequencies, as in Ahmed, Levin, and Wilson (2004). In line with Bernanke’s (2004) conjecture, the explanation is that conventional econometric methods are intrinsically incapable of capturing the role played by the systematic component of monetary policy in (de)stabilising in- flation expectations, and are therefore inevitably bound to confuse shifts in expected inflation with true structural innovations, thus giving the illusion of good luck even when good policy is, by construction, the authentic explanationGreat Inflation, indeterminacy, structural break tests, frequency domain, VARs.

Unconventional monetary policy and the great recession - Estimating the impact of a compression in the yield spread at the zero lower bound

We explore the macroeconomic impact of a compression in the long-term bond yield spread within the context of the Great Recession of 2007-2009 via a Bayesian time-varying parameter structural VAR. We identify a ‘pure’ spread shock which, leaving the short-term rate unchanged by construction, allows us to characterise the macroeconomic impact of a compression in the yield spread induced by central banks’ asset purchases within an environment in which the short rate cannot move because it is constrained by the zero lower bound. Two main findings stand out. First, in all the countries we analyse (U.S., Euro area, Japan, and U.K.) a compression in the long-term yield spread exerts a powerful effect on both output growth and inflation. Second, conditional on available estimates of the impact of the FED’s and the Bank of England’s asset purchase programmes on long-term government bond yield spreads, our counterfactual simulations indicate that U.S. and U.K. unconventional monetary policy actions have averted significant risks both of deflation and of output collapses comparable to those that took place during the Great Depression. JEL Classification: E30, E32Bayesian VARs, Great Recession, Monte Carlo integration, policy counterfactuals, stochastic volatility, structural VARs, time-varying parameters

Joint estimation of the natural rate of interest, the natural rate of unemployment, expected inflation, and potential output

We jointly estimate the natural rate of interest, the natural rate of unemployment, expected inflation, and potential output for the Euro area, the United States, Sweden, Australia, and the United Kingdom. Particular attention is paid to time-variation in (i) the data-generation process for inflation, which we capture via a time-varying parameters specification for the Phillips curve portion of the model; and (ii) the volatilities of disturbances to inflation and cyclical (log) output, which we capture via break tests. Time-variation in the natural rate of interest is estimated to have been comparatively large for the United States, and especially for the Euro area, and smaller for Australia and the United Kingdom. Overall, natural rate estimates are characterised by a significant extent of uncertainty. JEL Classification: E31, E32, E52monetary policy, Natural rate of interest, time-varying parameters

Investigating time-variation in the marginal predictive power of the yield spread

We use Bayesian time-varying parameters VARs with stochastic volatility to investigate changes in the marginal predictive content of the yield spread for output growth in the United States and the United Kingdom, since the Gold Standard era, and in the Eurozone, Canada, and Australia over the post-WWII period. Overall, our evidence does not provide much support for either of the two dominant explanations why the yield spread may contain predictive power for output growth, the monetary policy-based one, and Harvey’s (1988) ‘real yield curve’ one. Instead, we offer a new conjecture. JEL Classification: E42, E43, E47Bayesian VARs, medianunbiased, stochastic volatility, time-varying parameters

VAR analysis and the Great Moderation

Most analyses of the U.S. Great Moderation have been based on structural VAR methods, and have consistently pointed towards good luck as the main explanation for the greater macroeconomic stability of recent years. Based on an estimated New-Keynesian model in which the only source of change is the move from passive to active monetary policy, we show that VARs may misinterpret good policy for good luck. First, the policy shift is suficient to generate decreases in the theoretical innovation variances for all series, and decreases in the variances of inflation and the output gap, without any need of sunspot shocks. With sunspots, the estimated model exhibits decreases in both variances and innovation variances for all series. Second, policy counterfactuals based on the theoretical structural VAR representations of the model under the two regimes fail to capture the truth, whereas impulse-response functions to a monetary policy shock exhibit little change across regimes. Since these results are in line with those found in the structural VARbased literature on the Great Moderation, our analysis suggests that existing VAR evidence is compatible with the ‘good policy’ explanation of the Great Moderation. JEL Classification: E38, E52DSGE Models, Great Moderation, indeterminacy, vector autoregressions