Why Do World War II Veterans Earn More than Nonveterans?
检验二战老兵的收入溢价是否源于高收入潜力者的非随机选择，利用1942-1947年征兵优先权基于出生日期的特点构建工具变量，发现老兵收入并不高于可比非老兵，甚至可能更低。
World War II veterans earn more than nonveterans in their cohort. We test whether the World War II veteran premium reflects nonrandom selection into the military of men with higher earnings potential. The estimation is based on the fact that from 1942 to 1947 priority for conscription was determined by date of birth. Information on individuals' dates of birth may therefore be used to construct instrumental variables for veteran status. Empirical results from the 1960, 1970, and l980 censuses, along with two other microdata sets support a conclusion that World War II veterans earn no more than comparable nonveterans and may well earn less. Copyright 1994 by University of Chicago Press.