作者:GUSTMAN, AL; STEINMEIER, TL
作者单位:National Bureau of Economic Research; Texas Tech University System; Texas Tech University
作者:GOTTSCHALK, P; MALONEY, T
作者单位:Bowdoin College; University of Missouri System; University of Missouri Columbia
作者:BURTLESS, G; MOFFITT, RA
作者单位:Brown University