As somebody who works in international trade, IN. The costs are outweighed tenfold by the fact that goods and services here have easy access to the largest free trade area in the world.
If we flounce out do you think we’ll be allowed to keep that access? The central EU powers will have a distinct interest in making our lives harder to deter others from doing likewise.
Whilst we may eventually get some kind of agreement it will be neither guaranteed nor permanent, hardly the kind of thing to commit to a major investment on.
When the US and EU finally put ink to paper on the TTIP we’ll be even more isolated.
It’s going to be painful, very painful.
Sadly I suspect the debate will be informed more by the flag waving hysterics of the Daily Mail than carefully considered economic conclusions as these aren’t nearly as much fun when it comes to writing lurid headlines.