The net migration target has caused some tension within the coalition, with Lib Dems and some Tories - including Mayor of London Boris Johnson - believing it risks send the wrong signals to foreign students and hampering the economic recovery.

BBC: Annual net migration to UK falls below 200,000

In a 2010 post he writes about the tension between immigration and the social safety net, but again this does not apply to high skilled immigrants who make a stronger social safety net more affordable.

FORBES: A Question for Paul Krugman