So, there's this idea of comparative advantage. Two companies are both producing widgets, but for some reason one company can produce goods cheaper than the other. The reasons might be things like technology, company or regional culture, training of employees, cost of resources, or geography. If no trade is allowed, then the company with the comparative example can only operate within it's own region. If trade is allowed, then everyone gets the benefit of the cheaper product. Furthermore, the economy is more efficient now!
An example: If it costs Company A $2 to make a widget, and it costs Company B $3 to make a widget, then trading will lower the price. Company B may still be able to be in business, but consumers will get the benefit of competition between the two and having lower prices. Furthermore, because Company A probably selling more widgets now that we've allow trade, the economy is also more efficient, because we're spending less money just producing widgets.
The idea that trade is beneficial is widely accepted. ( http://www.igmchicago.org/surveys/free-trade ) Protectionism is just one example of an anti-trade policy, so it follows that protectionism is bad, inefficient, and a tradeoff in which there are a few local winners, but at the cost of global efficiency, and as a direct tax on the people living in the region that's "protected".
Khan Academy on trade & comparative advantage: https://www.khanacademy.org/economics-finance-domain/microec...
A longer essay about the topic, which addresses the common arguments for protectionism (i.e. infant industries, spillover effects, national security, unequal exchange): http://www.e-ir.info/2012/08/28/the-causes-and-effects-of-ec...
And that's why I say it's a case-by-case scenario. In my example above we've added like two or three real-world factors and ended up so far from the simple world of comparative advantage that we're barely even talking about the same hypothetical anymore. I don't mind protectionism in some instances because I know that we won't implement our economically perfect, kaldor-hicks tax and because of that free-trade has had and will continue to have distinctly negative effects on real people and real families.
EDIT: apologies about the textwall.
I wasn't actually familiar with Kaldor-Hicks improvement by name, but that was definitely the idea I was getting at! Kaldor-Hicks improvement is defined in a funny way (i.e. could taxes be added such that we have no losers), but it seems like a proxy for "there is a net benefit / overall people are getting wealthier".
There is also now excess money in the wallets of the consumers. Consumer savings rates are pretty steady, so they're still going to spend money. The rest of the economy will benefit from that, and should be able to find a good use of our unemployed american t-shirt maker. America exports a lot of machines, especially those machines used in developing world factories.
I'm okay with there being losers, as long as the gains are more. Because in every industry this choice between "a sliver more wealth for everyone and a few losers" builds in aggregate. And I'm in favor of global improvement-- I have no (nationalistic/whatever) allegiance to the people who happen to be living near me.
Your problem is that there are losers at all. Do you feel like we should have banned the car, for the sake of stablehands and horseshoe cobblers? Do you think we should have banned the light bulb, for the sake of candle makers? I know these examples are about technology improvements rather than laws, but it's the same principle-- greater good, with the side benefit of free choice.
>should be able to find a good use of our unemployed american t-shirt maker.
This is just a total handwave though. There's nothing in your economic theory that says these people are going to find good employment, it's just wishful thinking. We had jobs, we sent them somewhere else, now there's less jobs. Plenty of people who worked at the car plants will never have another job as good. I don't know the history but I'd say that there probably plenty of cobblers who never found as good of employment again either.
>I have no (nationalistic/whatever) allegiance to the people who happen to be living near me.
That puts you in a tiny minority though. Most people aren't true globablists.
>Do you feel like we should have banned the car, for the sake of stablehands and horseshoe cobblers?
No, because then most of us lose (we don't get cars), I feel we should have taxed cars and redistributed that money to unemployed stablehands and cobblers though. Then we all win!
Let me pose to you a hypothetical example. ABC Corp sells $20 shirts in America. It moves its shirt factory from America to Cambodia. It still sells its shirts for $20. Its new profits are greater than the lost wages of the americans it laid off. If all that profit were distributed to one person, say the CEO would you still think it morally good?
I think that example might get at the heart of our disagreement.
And just to be clear what you're saying is that you're fine with workers in 3rd world countries (who are poor) and workers in 1st world countries (who are rich) meeting in the middle? Do you support unlimited H1B visas?