Lower and Upper Bounds of Returns to Schooling: An Exercise in IV estimation with Different Instruments
Several recent studies based on 'exogenous' sources of variation in education outcomes show Instrumental Variables (IV) estimates of returns to schooling that are substantially higher than the corresponding Ordinary Least Squares (OLS) estimates. Card (1995a) suggests that these results can be explained by the existence of heterogenity in individual returns and by the fact that these studies are based on instruments that influence only the educational decision of individuals with high marginal returns due to either liquidity constraints or to high ability. This conclusion is consistent with the Local Average Treatment Effect (LATE) interpretation of IV (Imbens and Angrist, 1994), according to which IV identifies only the average returns of those who comply with the assignment-to-treatment mechanism implied by the instrument. We show evidence for Germany suggesting that returns to schooling are heterogeneous, instruments do matter and the LATE interpretation of IV makes sense. With an appropriate choice of instruments we also show how IV can be used to approximate the range of variations of returns to schooling in Germany.
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- Colm Harmon & Ian Walker, 1996.
"The Marginal and Average Returns to Schooling","
96/20, University College Dublin, Economics Department.
- Colm Harmon & Ian Walker, 1997. "The Marginal and Average Returns to Schooling," Keele Department of Economics Discussion Papers (1995-2001) 97/07, Department of Economics, Keele University.
- Colm Harmon & Ian Walker, 1996. "The marginal and average returns to schooling," Working Papers 199620, School of Economics, University College Dublin.
- Colm Harmon & Ian Walker, 1996. "The marginal and average returns to schooling," IFS Working Papers W96/11, Institute for Fiscal Studies.
- Ichino, Andrea & Winter-Ebmer, Rudolf, 1998. "The Long-Run Educational Cost of World War II: An Example of Local Average Treatment Effect Estimation," CEPR Discussion Papers 1895, C.E.P.R. Discussion Papers.
- John Bound & David A. Jaeger, 1996. "On the Validity of Season of Birth as an Instrument in Wage Equations: A Comment on Angrist & Krueger's "Does Compulsory School Attendance Affect Scho," NBER Working Papers 5835, National Bureau of Economic Research, Inc.
- Imbens, Guido W & Angrist, Joshua D, 1994. "Identification and Estimation of Local Average Treatment Effects," Econometrica, Econometric Society, vol. 62(2), pages 467-475, March.
- Joshua D. Angrist & Guido W. Imbens, 1995. "Identification and Estimation of Local Average Treatment Effects," NBER Technical Working Papers 0118, National Bureau of Economic Research, Inc.
- Checchi, Daniele & Ichino, Andrea & Rustichini, Aldo, 1996. "More Equal but Less Mobile? Education Financing and Intergenerational Mobility in Italy and in the United States," CEPR Discussion Papers 1496, C.E.P.R. Discussion Papers. Full references (including those not matched with items on IDEAS)
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