Is migration supply--or demand--determined? Some remarks on the ideological use of economic language

The author briefly discusses debate on the question of "whether international migration is essentially 'supply-determined' or 'demand-determined'.... In general, the supply school holds that there are any number of migrants willing to move (usually from poor to rich countries) irrespective of demand conditions in their destination countries, whereas the demand school claims that migration actually emerges out of specific demand conditions in prospective immigration countries.... By explicitly applying economic concepts of supply and demand to migration analysis--restricting attention to the situation in receiving countries--migration can rarely be called supply--or demand--determined alone, but will usually depend on the interaction of these forces." (SUMMARY IN FRE AND SPA)