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Abstract:
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 sufficient 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.

Great Moderation, DSGE models, indeterminacy, vector autoregressions

Abstract:
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.

Monetary policy, natural rate of interest, time-varying parameters, Monte Carlo integration, median-unbiased estimation, endogenous break tests, bootstrapping

Abstract:
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.

Inflation, European Monetary Union, inflation targeting, Gold Standard, Lucas critique, median-unbiased estimation, Markov Chain Monte Carlo

Abstract:
Over the last two centuries, the coherence between either narrow or broad money growth and inflation at zero has exhibited little variation-being, most of the time, close to one-in the US, the UK, and several other countries, thus implying that the fraction of inflation's long-run variation explained by long-run money growth has been very high and relatively stable. The gain at zero, on the other hand, has exhibited significant changes, being for long periods of time smaller than one. The unitary gain associated with the quantity theory of money appeared in correspondence with the inflationary outbursts associated with World War I and the Great Inflation - but not World War II - whereas following the disinflation of the early 1980s the gain dropped below one for all the countries and all the monetary aggregates I consider, with one single exception. I propose an interpretation for this pattern of variation based on the combination of systematic velocity shocks and infrequent inflationary outbursts.

Quantity theory of money, inflation, frequency domain, cross-spectral analysis, band-pass filtering, DSGE models, Bayesian estimation, trend inflation

Abstract:
We use a Bayesian time-varying parameters structural VAR with stochastic volatility for GDP deflator inflation, real GDP growth, a 3-month nominal rate, and the rate of growth of M4 to investigate the underlying causes of the Great Moderation in the United Kingdom. Our evidence points towards a dominant role played by shocks in fostering the more stable macroeconomic environment of the last two decades. Results from counter- factual simulations, in particular, show that (1) the Great Inflation was due, to a dominant extent, to large demand non-policy shocks, and to a lesser extent - especially in 1973 and 1979 - to supply shocks; (2) imposing the 1970s' monetary rule over the entire sample period would have made almost no difference in terms of inflation and output growth outcomes; and (3) mechanically 'bringing the Monetary Policy Committee back in time' would only have had a limited impact on the Great Inflation episode, at the cost of lower output growth. These results are quite striking in the light of the more traditional, narrative approach, which suggests that the monetary policy regime is an important factor in explaining the Great Moderation in the United Kingdom. We discuss one interpretation which could explain both sets of results, based on the 'indeterminacy hypothesis' advocated, for the United States, by Clarida, Gali, and Gertler (2000) and Lubik and Schorfheide (2004).

Bayesian VARs, stochastic volatility, identified VARs, timevarying parameters, frequency domain, Great Inflation, policy counterfactuals, Lucas critique, European Monetary System

Abstract:
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.

Bayesian VARs, stochastic volatility, time-varying parameters, median-unbiased estimation, Monte Carlo integration

Abstract:
Using a structural VAR with time-varying parameters and stochastic volatility on post-WWII U.S. data, we document a striking negative correlation between the evolution of the long-run coefficient on inflation in the monetary rule and the evolution of the persistence and predictability of inflation relative to a trend component. Using a standard sticky-price model, we show that a more aggressive policy stance towards inflation causes a decline in inflation predictability, providing a possible interpretation for the findings of the structural VAR.

Bayesian time-varying VARs, sign restrictions, frequency domain, Great Inflation, predictability

Abstract:
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.

New Keynesian models, inflation persistence, Bayesian estimation