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Google圖書搜尋
The Co-twin Methodology and Returns to Schooling
Örjan Sandewall
David Cesarini
Magnus Johannesson
其他書名
Testing a Critical Assumption
出版
Research Inst. of Industrial Economics
, 2009
URL
http://books.google.com.hk/books?id=5rH4xwEACAAJ&hl=&source=gbs_api
註釋
Twins-based estimates of the return to schooling feature prominently in the labor economics literature. The validity of such estimates hinges critically on the assumption that within-pair variation in schooling is explained by factors which are unrelated to wage earning ability. This paper develops a framework for testing this assumption, and finds, using a unique dataset of monozygotic twins, strong evidence against it. Differences in adolescent IQ test scores predict within-pair variation in educational attainment, and including IQ in the wage equation causes within-pair point estimates for the returns to schooling to decline significantly. Our results thus cast doubt on the validity of estimates derived from the co-twin literature.
