We present a two-country political economic model of income redistribu
tion with internationally mobile labor. Migration can be exogenous and
/or endogenous (i.e., determined by labor income differentials). Polit
ical influence is determined by the size and homogeneity of the groups
, where the latter can be affected by immigration. We show that immigr
ation can increase the transfers to, and the income of, the mobile gro
up. We also investigate the possibility of migration regulation, tax-t
ransfer policy competition and coordination and, finally, coordination
of regulation policies. it is shown that the selection of any of thos
e regimes will depend on the particular distribution of political infl
uence among the relevant social groups in the two countries.