Estimating Returns to Education: Three Natural Experiment Techniques Compared

We compare three quasi-experimental approaches to estimating the returns to schooling in Australia: instrumenting schooling using month of birth, instrumenting schooling using changes in compulsory schooling laws, and comparing outcomes for twins. With annual pre-tax income as our measure of income, we find that the naive (OLS) returns to an additional year of schooling is 13%. The month of birth IV approach gives an 8% rate of return to schooling, while using changes in compulsory schooling laws as an IV produces a 12% rate of return. Finally, we review estimates from twins studies. While we estimate a higher return to education than previous studies, we believe that this is primarily due to the better measurement of income and schooling in our dataset. Australian twins studies are consistent with our findings insofar as they find little evidence of ability bias in the OLS rate of return to schooling. Our estimates of the ability bias in OLS estimates of the rate of return to schooling range from 9% to 39%. Overall, our findings suggest the Australian rate of return to education, corrected for ability bias, is around 10%, which is similar to the rate in Britain, Canada, the Netherlands, Norway and the United States.

[1]  A. Preston.  Where Are We Now With Human Capital Theory in Australia , 1997 .

[2]  N. Martin,et al.  What Do Twins Studies Reveal about the Economic Returns to Education? A Comparison of Australian and U.S. Findings , 1995 .

[3]  F. Galindo-Rueda,et al.  Do a Few Months of Compulsory Schooling Matter? The Education and Labour Market Impact of School Leaving Rules , 2004, SSRN Electronic Journal.

[4]  Marcelo J. Moreira,et al.  On the Validity of Econometric Techniques with Weak Instruments , 2005, The Journal of Human Resources.

[5]  T. Spector,et al.  Returns to Education: Evidence from UK Twins , 2002 .

[6]  Vincent Hogan,et al.  Using Heteroscedasticity to Estimate the Returns to Education , 2002 .

[7]  Orley Ashenfelter,et al.  Estimates of the Economic Return to Schooling from a New Sample of Twins , 1992 .

[8]  J. Angrist,et al.  Does Compulsory School Attendance Affect Schooling and Earnings? , 1990 .

[9]  N. Martin,et al.  The return to schooling: Estimates from a sample of young Australian twins , 2006 .

[10]  E. Plug.  Season of birth, schooling and earnings , 2001 .

[11]  J. Angrist,et al.  Empirical Strategies in Labor Economics , 1998 .

[12]  David A. Jaeger,et al.  Problems with Instrumental Variables Estimation when the Correlation between the Instruments and the Endogenous Explanatory Variable is Weak , 1995 .

[13]  M. Blackburn,et al.  Are Ols Estimates of the Return to Schooling Biased Downward? Another Look , 1993 .

[14]  F. Vella,et al.  Estimating the returns to education for Australian youth via rank-order instrumental variables , 1999 .

[15]  Returns to Education in Germany: A Variable Treatment Intensity Approach , 2001 .

[16]  C. Meghir,et al.  Ability, parental background and educational policy: empirical evidence from a social experiment , 2003 .

[17]  David Card,et al.  Using Geographic Variation in College Proximity to Estimate the Return to Schooling , 1993 .

[18]  E. Duflo.  Schooling and Labor Market Consequences of School Construction in Indonesia: Evidence from an Unusual Policy Experiment , 2000 .

[19]  Till M. von Wachter,et al.  The E¤ect of Compulsory Schooling in Germany , 2022 .

[20]  G. Isacsson.  Estimates of the return to schooling in Sweden from a large sample of twins , 1999 .

[21]  Sandra E. Black,et al.  Fast Times at Ridgemont High? The Effect of Compulsory Schooling Laws on Teenage Births , 2004, SSRN Electronic Journal.

[22]  John Bound,et al.  Double Trouble: On the Value of Twins-Based Estimation of the Return to Schooling , 1998 .

[23]  Claudia Goldin,et al.  Mass Secondary Schooling and the State , 2003 .

[24]  The Effect of Age at School Entry on Educational Attainment in Germany , 2005, SSRN Electronic Journal.

[25]  D. Neumark.  Biases in twin estimates of the return to schooling , 1999 .

[26]  A. Barcan.  A history of Australian education , 1980 .

[27]  J. Stock,et al.  Instrumental Variables Regression with Weak Instruments , 1994 .

[28]  Orley Ashenfelter,et al.  Income, Schooling, and Ability: Evidence from a New Sample of Identical Twins , 1997 .

[29]  C. Harmon,et al.  Estimates of the Economic Return to Schooling for the United Kingdom , 1995 .

[30]  Paul Taubman,et al.  Endowments and the Allocation of Schooling in the Family and in the Marriage Market: The Twins Experiment , 1994, Journal of Political Economy.