In the two-country model of international labour mobility Select one: O a. the effect of migration is to cause real wages in the two countries to diverge. O b. labor has only limited international mobility. O c. the effect of migration is to cause real wages in the two countries to converge. O d. the long-run equilibrium global real wage is equal to the lesser of the pre- migration wages in the two countries. Oe. the long-run equilibrium global real wage is equal to the greater of the pre- migration wages in the two countries.