Case for Open Borders

Free movement of labor (human capital) across borders has to be coupled with free movement of financial capital and free movement of goods as well as free internal labor markets meaning no minimum wage, no other barriers to entry into professions, and no welfare for at least a few years.

Otherwise, all incentives go haywire and the lowest income groups in the host country get shut out of labor markets where newcomers are willing to undercut them severely while working in businesses to which they are ethnically connected.