From The Washington Post
Supporters of the Trans-Pacific Partnership (TPP), a trade agreement under negotiation between the United States and 11 other countries, make this case: Trade between countries is always good, and more trade with more countries is even better. Harvard economist Greg Mankiw goes further in a recent New York Times piece, arguing that anyone opposed to trade deals does not understand elementary economics.
The arguments made by these advocates do not match the reality of the modern world and are not helpful for thinking about what is at stake in the TPP. It’s not a question of understanding economics. It’s a question of knowing precisely what we’re agreeing to when we sign the TPP.
In the simple models of introductory textbooks, countries improve their respective economic outcomes by specializing in their “comparative advantage” — the goods they produce more efficiently than their trade partners — thereby increasing the supply of goods and lowering prices. No government subsidy is involved, nobody cheats, everyone is well-informed about the nature of the deal, and pretty much all parties come out ahead. If anyone loses their job, in those models either they get another good job or they can be fairly compensated by the people who gain extra income.