Of course the EU and member states must work to ensure that people moving from one country to another understand their obligations and their rights in areas like health, road safety and further education.

That's where my job comes in. Getting the E.U. and U.S. to agree.

Indeed, American companies make three times as much profits from their investment in one E.U. country, Ireland, than they do from all their investments in China.

If the EU and the US can cooperate successfully on regulating financial markets, everyone else will follow.

But our system of regulation must keep up with this. If it fails to keep up, it will hold back economic expansion. We need financial market regulation that works at national and European level.

David Cameron says he wants to keep Britain in the EU, but his tactics are so divisive that, if he gets what he wants it will be at the price of huge ill-will in Europe; or if he doesn't, it will be at the price of increased anti-EU sentiment in his own party and in British society.

The European Union is the world's most successful invention for advancing peace.