Recent Flattening in the Higher Education Wage Premium: Polarization, Skill Downgrading, or Both?
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The wage gap btw college and non-college workers expanded rapidly in the 1980s, but its growth has slowed significantly since 2000, remaining largely unchanged btw 2010 and 2015.
Valletta's research cited in WSJ article (Note attached) on college wage premium, finds that the wage gap btw college and now college grew rapidly during the 1980's, and that growth of the wage gap flattened btw 2010-2015. note he adjust for composition shift, "...These controls adjust for the changing composition of the estimation sample, so that the results for the education categories reflect the average wage premium associated with educational attainment for an individual with a fixed set of other demographic characteristics..."but does so by demographic factors not by the likely deterioration in quality of college graduates in section. He does find, "....Figure 3 also indicates that the higher education wage premiums are larger for older than for younger workers, by about 5-10 log points on average.."which is perhaps capturing the quality deterioration in college graduates
"..Wage gaps between workers with a college or graduate degree and those with only a high school degree rose rapidly in the United States during the 1980s. Since then, the rate of growth in these wage gaps has progressively slowed, and though the gaps remain large, they were essentially unchanged between 2010 and 2015.... I assess this flattening over time in higher education wage premiums with reference to two related explanations for changing U.S. employment patterns: (i) a shift away from middle-skilled occupations driven largely by technological change (“polarization”); and (ii) a general weakening in the demand for advanced cognitive skills (“skill downgrading”). Analyses of wage and employment data from the U.S. Current Population Survey suggest that both factors have contributed to the flattening of higher education wage premiums.... In particular, after rising substantially in the 1980s, growth in the wage gap between individuals with a four-year college or graduate degree and those with a high school degree slowed progressively. The gaps have changed little since the year 2000, and they were flat to down during the period 2010-2015.... Between 2000 and 2010, only holders of graduate degrees saw any meaningful increase in real wages. Between 2010 and 2015, real wages were flat to down slightly for all groups. The gap in average real wages between individuals with a four-year college degree or graduate degree and high school graduates rose from 40-67 percent in 1980 to 72-120 percent as of 2015.... These patterns suggest that the previously growing complementarity between highly educated labor and new production technologies, especially those that rely on computers and related organizational capital, may be leveling off..... Occupational employment shifts have held down the college-only premium somewhat since the year 2000, suggesting that college-educated workers are increasingly sliding down into routine jobs. This is consistent with polarization or skill downgrading. More recently, since 2010, the wage gap between graduate degree holders and the college-only group within the same broad occupations has declined somewhat, suggesting that graduate training may be providing less of a competitive edge than it has in the past. This suggests that skill downgrading may be playing an increasingly important role at the top of the skill distribution. Overall, the results suggest rising competition between education groups for increasingly scarce well-paid jobs.....Although higher education may be financially advantageous on average, the flattening of returns as costs have continued to rise suggests that college may be an unfavorable financial investment for rising numbers of individuals..."
Robert Valletta, "Recent Flattening in the Higher Education Wage Premium: Polarization, Skill Downgrading, or Both?," National Bureau of Economic Research, August 2016, https://www.nber.org/chapters/c13705.pdf





