This article uses a unique set of pooled cross-sectional and rime series da
ta to examine the annual rate of U.S, immigration during 1972-1991 from 60
source countries. One distinguishing feature of the article is that it brea
ks out and cross-classifies various classes of immigrants-numerically limit
ed versus numerically exempt and new immigrant versus adjustment of status.
A second distinguishing feature is that it utilizes a unique vector of var
iables relating to the presence and characteristics of various social progr
ams in source countries. The models developed here emphasize the importance
of both differential economic advantage and the ease with which a prospect
ive migrant can transfer skills to the U.S. labor market. Hausman-Taylor in
strumental variable estimates of the coefficients indicate that in addition
to other Factors, social programs in source countries are significant dete
rminants of immigration to the U.S.A.