Thomas Piketty has an interesting observation on globalisation and migration/borders.

From slide 11 from a lecture from July (and in earlier talks too):

Globalisation—under the current rules of the game—puts a constraint on the expansion of economies. So Piketty thinks that this can explain the debate around migration since the last few years. Although he doesn’t say that, I’d imagine that he is saying that the distribution of income favouring lower classes is difficult because of the race to the bottom caused by globalisation.