In‐School Work Experience and the Returns to Schooling
利用美国青年纵向调查数据，发现传统工资模型因未控制在校工作经验而高估了教育对工资的影响，高估幅度达25%-44%。
Students often accumulate substantial work experience before leaving school. Because conventional earnings functions do not control for in-school work experience, their estimates of the return to schooling include the benefit of work experience gained along the way. Using data from the National Longitudinal Survey of Youth, I estimate wage models with and without controls for in-school work experience. The estimated schooling coefficients are 25%-44% higher (depending on how I control for ability bias) when in-school work experience is omitted than when it is included. These findings indicate that conventional models significantly overstate the wage effects of "school only." Copyright 2001 by University of Chicago Press.