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Author:Ahn, Hie Joo 

Working Paper
Heterogeneity in the Dynamics of Disaggregate Unemployment

This paper explores the role that unobserved heterogeneity within an observed category plays in the dynamics of disaggregate unemployment and in the cross-sectional differences across individuals of the duration of unemployment spells. The distribution of unobserved heterogeneity is characterized as a mixture of two distributions with each mean and weight determined by the inflows and outflows of workers with unobserved types H and L, which are identified based on the nonlinear state-space model of Ahn and Hamilton (2016). I found that the contribution of each factor to the dynamics of ...
Finance and Economics Discussion Series , Paper 2016-063

Working Paper
Dynamic Beveridge Curve Accounting

We develop a dynamic decomposition of the empirical Beveridge curve, i.e., the level of vacancies conditional on unemployment. Using a standard model, we show that three factors can shift the Beveridge curve: reduced-form matching efficiency, changes in the job separation rate, and out-of-steady-state dynamics. We find that the shift in the Beveridge curve during and after the Great Recession was due to all three factors, and each factor taken separately had a large effect. Comparing the pre-2010 period to the post-2010 period, a fall in matching efficiency and out-of-steady-state dynamics ...
Finance and Economics Discussion Series , Paper 2020-027

Working Paper
Heterogeneity and Unemployment Dynamics

This paper develops new estimates of flows into and out of unemployment that allow for unobserved heterogeneity across workers as well as direct effects of unemployment duration on unemployment-exit probabilities. Unlike any previous paper in this literature, we develop a complete dynamic statistical model that allows us to measure the contribution of different shocks to the short-run, medium-run, and long-run variance of unemployment as well as to specific historical episodes. We find that changes in the inflows of newly unemployed are the key driver of economic recessions and identify an ...
Finance and Economics Discussion Series , Paper 2016-12

Working Paper
Precautionary On-the-Job Search over the Business Cycle

This paper provides new evidence for cyclicality in the job-search effort of employed workers, on-the-job search (OJS) intensity, in the United States using American Time Use Survey and various cyclical indicators. We find that OJS intensity is countercyclical along both the extensive and intensive margins, with the countercyclicality of extensive margin stronger than the other. An increase in the layoffs rate and the deterioration in expectations about future personal financial situation are the primary factors that raise OJS intensity. Our findings suggest that the precautionary motive in ...
Finance and Economics Discussion Series , Paper 2017-025

Working Paper
Measuring Labor-Force Participation and the Incidence and Duration of Unemployment

The underlying data from which the U.S. unemployment rate, labor-force participation rate, and duration of unemployment are calculated contain numerous internal contradictions. This paper catalogs these inconsistencies and proposes a reconciliation. We find that the usual statistics understate the unemployment rate and the labor-force participation rate by about two percentage points on average and that the bias in the latter has increased since the Great Recession. The BLS estimate of the average duration of unemployment overstates by 50% the true duration of uninterrupted spells of ...
Finance and Economics Discussion Series , Paper 2019-035

Discussion Paper
A New Indicator of Common Wage Inflation

The cyclical state of the economy and the natural rate of unemployment are key unobserved variables in policymakers' analysis of economic developments. The price Phillips curve relates the measures of resource utilization—often through deviations of the unemployment rate from the natural rate of unemployment—to consumer price inflation.
FEDS Notes , Paper 2020-07-08

Discussion Paper
Factors in Unemployment Dynamics

The U.S. unemployment rate averaged 8.4% during the first five years of recovery from the Great Recession of 2007-2009, the weakest recovery on record. But as the expansion continued, unemployment continued to decline and by 2018 reached the lowest levels in almost half a century. In this Note, we explore why unemployment remained so high for so long, and what factors contributed to the recent lows.
FEDS Notes , Paper 2018-12-21-3

Discussion Paper
A New Indicator of Common Wage Inflation

The cyclical state of the economy and the natural rate of unemployment are key unobserved variables in policymakers' analysis of economic developments. The price Phillips curve relates the measures of resource utilization—often through deviations of the unemployment rate from the natural rate of unemployment—to consumer price inflation.
FEDS Notes , Paper 2020-07-08

Working Paper
Revealing Cluster Structures Based on Mixed Sampling Frequencies

This paper proposes a new nonparametric mixed data sampling (MIDAS) model and develops a framework to infer clusters in a panel regression with mixed frequency data. The nonparametric MIDAS estimation method is more flexible and substantially simpler to implement than competing approaches. We show that the proposed clustering algorithm successfully recovers true membership in the cross-section, both in theory and in simulations, without requiring prior knowledge of the number of clusters. This methodology is applied to a mixed-frequency Okun's law model for state-level data in the U.S. and ...
Finance and Economics Discussion Series , Paper 2020-082

Discussion Paper
Index of Common Inflation Expectations

Data that are potentially informative about the inflation expectations of economic agents have grown over recent years and now include information from a wide variety of surveys as well as from financial instruments. These data differ along several key dimensions, including the type of economic agent, the horizon of the expectation, the source of data (survey versus market-based measures), and the associated inflation concept, which can make the co-movement of various expectations measures difficult to discern.
FEDS Notes , Paper 2020-09-02

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