tsubaki
Player Valuation: £90m
The basic economics is that we as a nation of 60 million people purchase more goods from Europe than we sell to a market of 500 million. If we focused on the opportunities to expand our share of the Single Market rather than economic growth rates we'd realise that Europe is a massively under-exploited market for the Brits.
We are infinitely stronger in Europe and focusing on capturing more market share than we ever will be cast adrift in an increasingly protectionist global market place.
The first paragraph contradicts the second, though.
One of the reasons Europe is a massively under-exploited market for Brits is because of the risks associated with competing with other parts of the EU, specifically those parts of their economy that other EU member states consider vital. Whilst the EU takes the form that it does, from inside there is no way we will ever grow our manufacturing base (for instance) because to do so would negatively affect the German manufacturing base, the German economy and ultimately the German government. So we leave manufacturing here to gently decline, whilst they leave our financial / services sector alone, and of course neither of us messes with the CAP because of the impact that it would have on the French.
All in all it leads to is economic specialization and stagnation, or worse in the southern EU states who aren't powerful enough to protect their own economic interests and who don't (yet) export labour to the richer states. If we are out of the EU as it currently exists, there won't be the incentive to accept this state of affairs and competition will probably bring some of our manufacturing base back (as well as losing some financial business to Europe, though you would imagine most of the nations that remain would balk at Frankfurt becoming the financial hub for the entire EU).
Of course, if the EU decided to reform the nation states out of existence and become one United States of Europe (something which is conspicuously not on the table anytime soon despite it being the stated goal of the union), then I do think we would be stronger as a part of it than by staying outside.