Trade is one of the oldest activities known to man. At one point in human history, someone decided that he wanted more than what he was capable of growing himself, so how do you go about getting something that you are not making yourself? Trade, of course. If I have wheat, I can make bread. But bread is ever so uninteresting if it is not transformed into a sandwich, so how am I going to get meat for the sandwich? You guessed it: trade.