Have labor market returns to cognitive skills declined across cohorts?
Core argument: The estimated decline in returns to pre-labor market cognitive skills for white men between the NLSY-1979 and NLSY-1997 cohorts depends critically on changes in the distribution of adjusted Armed Forces Qualifying Test (AAFQT) scores across the two cohorts.
It is well known that the wage structure widened in the U.S. labor market over the decades encompassing the early adulthood of the 1979 and 1997 National Longitudinal Survey of Youth (NLSY) cohorts. Although often overlooked, changing pre-labor market skill distributions may play a crucial role in capturing the evolution of labor market returns to cognitive skills. We show that for white men in the NLSY, the estimated decline over this period in the return to adjusted Armed Forces Qualifying Test (AAFQT) scores, which measure pre-labor market cognitive skills, critically depends on changes in the distribution of these scores between the two cohorts and particularly on the widening (and increased left-skewness) of the AAFQT distribution in the NLSY–97. To the extent that returns to cognitive skills did decline for the white men in our sample, they did so only at the lower part of the AAFQT distribution. This may prove especially important in the future given continuing changes in skill development in recent youth cohorts.




