That may not be entirely desirable. In the US that ability to move where the jobs are is creating a concentration of prosperity in certain cities. Often those

That may not be entirely desirable. In the US that ability to move where the jobs are is creating a concentration of prosperity in certain cities. Often those with above average skills are able to move, leaving the others behind. This leads to overcrowding in cities like NY and SF. Layer in economies of scale, increased competition, and better talent pools, and it becomes increasingly difficult for other areas to compete. Creates a kind of feedback loop which increases the geographical wealth disparity. The only thing that seems to balance that is the increase in cost-of-living in those areas.