作者:SMITH, JP; WELCH, F
作者单位:University of California System; University of California Berkeley
作者:WEISS, A; LANDAU, HJ
作者单位:National Bureau of Economic Research; AT&T; Nokia Corporation; Nokia Bell Labs
作者:HALL, RE; LAZEAR, EP
作者单位:University of Chicago; National Bureau of Economic Research
作者:MITCHELL, OS; FIELDS, GS
作者单位:National Bureau of Economic Research