Helgoland, you're only half-right. Yeah, poor countries need to export to gain the foreign exchange needed to import better technology and develop (importing machinery, paying for IP, etc etc). But no poor country got rich by free trade. They got there by cheating, copying IP, and giving generous support to their own companies. China, Japan, Korea, Taiwan, Germany and the US in the 19th century... All of them did it the same way.
Of course, rich countries don't like this, and try to prevent developing countries from imposing "unfair" competition (because apparently a fair competition is a poor country without much in the way of support, financial markets, IP, infrastructure or educated workforce.) They've always done so: just look at Britain's turnaround from protectionism to free trade champion once it established its position as an industrial leader in the 1870's.*
So yeah, the end goal is a more or less homogenously rich world with freedom of movement and trade. But free trade too soon will prevent us from ever achieving this goal.
An amazing book about China, Taiwan, Japan and SK's road to development is "
How Asia Works: Success and Failure in the World's Most Dynamic Region", by Joe Studwell, probably the single best book on development I ever read. "
Bad Samaritans: The Myth of Free Trade and the Secret History of Capitalism", by Ha-Joon Chang is pretty good to, but focus more on free trade. Also in favor of the second, it is available on some other bay-sites I'm not going to mention explicitly here.