A piece for the LSE's Brexit Vote blog on the 5 I's that will determine how the EU would respond to a Brexit and how we need to open up the theoretical analysis of the issue: http://blogs.lse.ac.uk/brexitvote/2015/12/03/europes-potential-responses-to-a-british-withdrawal-from-the-union-will-be-determined-by-ideas-interests-institutions-the-international-and-individuals/