Changes in Unemployment Duration and Labor Force Attachment
Katharine G. Abraham and Robert Shimer ,
The Roaring Nineties, ed. by A. B. Krueger and R. M. Solow

This paper accounts for the observed increase in unemployment duration relative to the unemployment rate in the U.S. over the past thirty years, typified by the record low level of short-term unemployment. We show that part of the increase is due to changes in how duration is measured, a consequence of the 1994 Current Population Survey redesign. Another part is due to the passage of the baby boomers into their prime working years.

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