David Boaz  of the Cato Institute  has a very nice brief essay  on trade, exposing several age-old errors that still crop up — even in publications whose writers and editors ought to know better.
Boaz’s conclusion is right-on:
The positive-sum character of trade is the very foundation of the liberal world order, the underpinning of expanding trade, international harmony, and peace. If one country’s success was another’s woe, then the socialists and nationalists would be right: World trade would be a war of all against all. Thankfully, they’re wrong. The growing productivity of China, Russia, and India is wonderful news for their two billion citizens and good news for everyone else in the world economy as well.