>As for the impact of immigrants on wages, they can effectively compete for 
>most jobs all over the world even without emigrating. If the potential 
>immigrants can't come to the capital, the capital can emigrate to where 
>the surplus wage-workers are. Perhaps that is the best solution anyhow, 
>but it is short-sighted to believe this doesn't have exactly the same 
>effect on market prices for labour as the other way around.
That does not apply to service economy that comprises a lion share of employment in most developed countries.
wojtek