This paper estimates the effect of paid employment on grades of full-time, four-year students from four nationally representative cross sections of the Harvard College Alcohol Study administered during 1993-2001. The relationship could be causal in either direction and is likely contaminated by unobserved heterogeneity. Two-stage GMM regressions instrument for work hours using paternal schooling and being raised Jewish, which are hypothesized to reflect parental preferences towards education manifested in additional student financial support but not influence achievement conditional on maternal schooling, college and class. Extensive empirical testing supports the identifying assumptions of instrument strength and orthogonality. GMM results show that an additional weekly work hour reduces current year GPA by about 0.011 points, roughly five times more than the OLS coefficient but somewhat less than recent estimates. Effects are stable across specifications, time, gender, class and age, but vary by health status, maternal schooling, religious background and especially race/ethnicity.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
14006.
Length: Date of creation: May 2008 Date of revision: Handle: RePEc:nbr:nberwo:14006
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Find related papers by JEL classification: I2 - Health, Education, and Welfare - - Education J22 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Time Allocation and Labor Supply
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Carneiro, Pedro & Heckman, James J., 2003.
"Human Capital Policy,"
IZA Discussion Papers
821, Institute for the Study of Labor (IZA).
[Downloadable!]
Other versions:
James Heckman & Pedro Carneiro, 2003.
"Human Capital Policy,"
NBER Working Papers
9495, National Bureau of Economic Research, Inc.
[Downloadable!] (restricted)