Evidence? Just read history. You can go back as far as Rome, and find the same results using the same logic. Trade is going to happen, period. Government intervention, like most things that governments do, screws things up, badly, because it becomes politics. If there were a world financial system where imbalances could be farily measured and they had the power to dictate policies to fine tune and direct world trade without outside influence it could possibly be done, but that's a fantasy. When politics gets involved fairness, objective measures, rational thinking, go right out the window. It becomes a tool to sway opinion, make up issues, basically screw with the general population who are nearly completely ignorant of issues except what they hear in between commercials. Free trade is really just trade. Nothing more than it has been since prehistoric times.