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Reassessing the Trends in the Relative Supply of College-Equivalent Workers in the U.S.: A Selection-Correction Approach

Zeynep Elitas, Hakan Ercan and Semih Tumen

MPRA Paper from University Library of Munich, Germany

Abstract: Among better-educated employed men, the fraction of full-time full-year (FTFY) workers is quite high and stable -- around 90 percent -- over time in the U.S. Among those with lower education levels, however, this fraction is much lower and considerably more volatile, moving within the range of 62-82 percent for high school dropouts and 75-88 percent for high school graduates. These observations suggest that the composition of unobserved skills may be subject to sharp movements within low-educated employed workers, while the scale of these movements is potentially much smaller within high-educated ones. The standard college-premium framework accounts for the observed shifts between education categories, but it cannot account for unobserved compositional changes within education categories. Our paper uses Heckman's two-step estimator on repeated Current Population Survey cross sections to calculate a relative supply series that corrects for unobserved compositional shifts due to selection into and out of the FTFY status. We find that the well-documented deceleration in the growth rate of relative supply of college-equivalent workers after mid-1980s becomes even more pronounced once we correct for selectivity. This casts further doubt on the relevance of the plain skill-biased technical change (SBTC) hypothesis. We conclude that what happens to the within-group unobserved skill composition for low-educated groups is critical for fully understanding the trends in the relative supply of college workers in the United States. We provide several interpretations to our selection-corrected estimates.

Keywords: Wage inequality; self selection; relative supply index; college premium; SBTC; FTFY (search for similar items in EconPapers)
JEL-codes: I24 J23 J24 J31 O33 (search for similar items in EconPapers)
Date: 2014-04-15
New Economics Papers: this item is included in nep-lab and nep-lma
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Related works:
Journal Article: Reassessing the trends in the relative supply of college-equivalent workers in the U.S.: a selection-correction approach (2015) Downloads
Working Paper: Reassessing the Trends in the Relative Supply of College-Equivalent Workers in the U.S.: A Selection-Correction Approach (2014) Downloads
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