What would be the consequences for the world economy if
(a) capital was fully mobile but labor was not?
(b) both capital and labor could travel to each other freely?
I mean, the standard of living of Americans is high, because Americans are comparatively much more productive than the Chinese or Africans, and that is because Americans are far more plentifully supplied with capital goods, i.e., tools, machines, etc. That there is so much capital accumulated in the US, and so little elsewhere, is a fact of history. But if national borders were perfectly permeable, and abstracting from the political problems of massive immigration, and assuming that only labor is mobile, i.e., unemployed people cannot move easily, isn’t it the case that (b) would result in the capital presently concentrated in the US becoming “spread” over the entire world? This would improve the standard of living of the poor in the “developing” countries but greatly lower the standard of living of the US factor owners, workers and such. Isn’t this laissez-faire ideal therefore not exactly desirable, if one takes the somewhat parochial view of “America first”?