Many recent studies that were based on "exogenous" sources of variation in education outcomes' IV estimates of returns to schooling were substantially higher than the corresponding OLS estimates. Card (1995a) suggests that these results are explained by the existence of heterogeneity in...

An important component of the long run cost of a war is the loss of human capital suffered by school age children who receive less education because of the war. We show that Austrian and German individuals who were ten years old during or immediately after the conflict received less education...

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...