This article outlines a theoretical system of extended stratification in or
der to account for differences between immigrants and natives in (1) the am
ount of time individuals devote to paid work and (2) the number of family m
embers participating in paid work. The basic argument is that immigrants wi
th a frame of reference that includes being socialized in a relatively poor
sending society tend to have greater work incentive than natives who have
been socialized in a richer host society. This variation in work incentive
obtains because the economic rewards achieved through additional work are e
valuated more highly by groups that have as their frame of reference a comp
aratively poor society. According to this argument, the intergroup differen
ce in work incentive should obtain even when economic need is held constant
. We derived two hypotheses and tested them with a comparative analysis of
immigrants and natives, including native coethnics of the immigrants. At th
e level of the individual and of the household, the findings are largely co
nsistent with the hypotheses.