作者:GYOURKO, J; TRACY, J
作者单位:Yale University; National Bureau of Economic Research
作者:BECKETTI, S; GOULD, W; LILLARD, L; WELCH, F
作者单位:University of Southern California; RAND Corporation
作者:GUSTMAN, AL; STEINMEIER, TL
作者单位:National Bureau of Economic Research; Texas Tech University System; Texas Tech University
作者:ALTONJI, JG; PAXSON, CH
作者单位:National Bureau of Economic Research; Princeton University