I will make some comments on the posts by the free traders, and then a couple statements regarding protectionism in general.
In another post above, I mention David Ricardo, the classical economist who developed the free-trade theory of comparative advantage, which stipulates that if each nation specializes in the production of goods in which it has a comparative cost advantage and then trades with other nations for the goods in which they specialize, there will be an overall gain in trade, and overall income levels should rise in each trading country. There is still some debate among economists as whether Ricardo was right.
While there might be some minor critcisms of Ricardo's law, I think you are overstating their significance by even mentioning a "debate among economists". The Ricardian law of comparative cost is merely a relatively trivial application of the much larger law of association to international trade. The concept that A can still benefit more by undertaking the production process which he is best at and leaving the other to B,
even if he's more productive than B in both lines of production, justifies the entire division of labor organization which is the foundation of modern catallactics. No, there isn't much debate there because without the law of association (and it's derivative, the law of comparative cost) there would be very little room for economic theory.
Also, I would add that Ricardo's law only applies to areas where labor and capital factors are relatively immobile. To the extent they are not, productive resources will be distributed across the globe in the most favorable areas for human effort. Otherwise the law of comparative cost kicks in.
One more comment directed at the free traders: at present, economic globalization is extremely limited in scope. When we look at Third World countries, only China and India are really reaping the benefits. The rest of the developing world continues to dwell in autarky and isolation. Latin America, Africa, and most parts of Asia except for certain strips of land in India and China (remember, a lot of the regions in those two countries are just as backwards as the rest of the Third World) remain disconnected from the global economy.
The vast majority of trade and investment flows (also indicators of "outsourcing") occurs between the rich countries. This continues to be true even during the era of China and India. Protectionists in both the developed and developing worlds are to blame for this chronic problem.
And I'll also have a few words about free trade in general. Third World workers enjoy their competitive advantage as compared to First World workers because of cheap labor costs. Wages are low in these countries because of low productivity due to a lack of capital. Take away these low wages and the workers - who willingly signed up for these jobs because most of the domestic alternatives are far worse - will lose their comparative advantage, and the consumers who benefit from cheaper prices will lose with them.
Remember that in any economy, there are always wants which remained unsatisfied. The law of comparative cost will shift a nation's workers from those which he is less value-productive to those which he is more value-productive.
Outsourcing is not always the best business move. Higher transportation costs and shoddy infrastructure in developing countries can often offset the advantages of cheap labor. Some companies have discovered this and are changing tack. But this is for firms to discover on their own - not for politicians to decide in advance.
Finally, I must note the limitations of economics. While there is
no economic argument against free trade, that does not mean the debate stops there. For the nationalist - Lou Dobbs for example - who believes that Americans "deserve" the jobs more than the Indians or Chinese, due to some twisted sense of patriotism (which is peculiar in ignoring the welfare of consumers), the economist can have nothing to say to him. At that point I withdraw from the debate
These are very general comments regarding free trade and much more can be said, but I prefer to wait until the protectionists barrage this thread with their fallacies.