An important drawback of single equation migration models is that in effect they assume wages and employment to be independent of the level of migration. Williamson has proposed instead a simple general equilibrium model with labour supply and demand equations for sending and receiving countries...

How migration affects economic welfare in sending and receiving countries is an important issue. This paper deals mainly with one aspect, the relation between immigration and the real wage in the host country. Theory is ambivalent on the outcome. While it is plausible to see immigration...