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Working Paper
Modeling aggregate investment: a fundamentalist approach
This paper applies some lessons from recent estimation of investment models with firm-level data to the aggregate data with an eye to rehabilitating convex costs of adjusting the capital stock. In recent firm-level work, the response of investment to output and other "fundamental" variables is interpreted in terms of the traditional convex-adjustment-cost model, implying annual capital-stock adjustment speeds on the order of 15 to 35 percent. In aggregate data, I find that this "fundamentalist" model can account for the reduced-form effect of output on investment and the estimated ...
Working Paper
An evaluation of the sources of aggregate price rigidity
Working Paper
Estimates of the productivity trend using time-varying parameter techniques
In the second half of the 1990s, U.S. productivity growth moved up to rates not seen in several decades. In this paper, I use time-varying parameter techniques to isolate trend from cyclical movements in productivity and to obtain an estimate of the trend rate of productivity growth. I examine models both with and without an explicit role for capital accumulation. I find that in the models without an explicit role for capital accumulation, trend productivity growth is estimated to have moved up from around 1-1/2 percent in the period from the early 1970s to the mid 1990s, to about 2-1/2 ...
Working Paper
What's happened to the Phillips curve?
The simultaneous occurrence in the second half of the 1990s of low and falling price inflation and low unemployment appears to be at odds with the properties of a standard Phillips curve. We find this result in a model in which inflation depends on the unemployment rate, past inflation, and conventional measures of price supply shocks. We show that, in such a model, long lags of past inflation are preferred to short lags, and that with long lags, the NAIRU is estimated precisely but is unstable in the 1990s. Two alternative modifications to the standard Phillips curve restore stability. One ...
Working Paper
When Can Trend-Cycle Decompositions Be Trusted?
In this paper, we examine the results of GDP trend-cycle decompositions from the estimation of bivariate unobserved components models that allow for correlated trend and cycle innovations. Three competing variables are considered in the bivariate setup along with GDP: the unemployment rate, the inflation rate, and gross domestic income. We find that the unemployment rate is the best variable to accompany GDP in the bivariate setup to obtain accurate estimates of its trend-cycle correlation coefficient and the cycle. We show that the key feature of unemployment that allows for precise ...
Working Paper
Does overtime use affect marginal cost?
Working Paper
Is hysteresis important for U.S. unemployment?
We look for evidence of "hysteresis" in the U.S. unemployment rate - that is, that current labor market outcomes affect the future equilibrium level of the unemployment rate. We first examine (using a variety of econometric tests for unit roots) whether the unemployment rate tends to come back to a long-run average over time. On balance, our results suggest that the unemployment rate tends to return to a long-run value, ruling out the possibility of permanent hysteresis. We look for evidence of temporary hysteresis by examining whether lagged unemployment enters a standard Phillips-curve ...