> All this should be a reminder that any trade deal has winners and losers and unintended consequences.
Obviously, whoever you subsidize is a winner. If you're setting up barriers to trade (e.g. tariffs), foreign sellers/manufacturers lose. If you're subsidizing imports, domestic sellers/manufacturers lose.
Why can't we just not subsidize anyone?! Free trade is supposed to be just that, free. Instead, we have the TPP & TTIP, which will create yet new injustices and new sets of winners and losers.
For example, post great depression america started tax subsidy for farmers to ensure a stable food supply. That hurts imports of the same product. Another interesting example is minimum wage, it makes imports more attractive, as domestic labor costs go up. Not getting into what is right/wrong, simply that economic incentives are not uniform and may be defensive. Hence international trade tries to deal with that via accords, treaties, tariffs etc.
Not to mention to that tariffs are a source of revenue for the respective government.
The purpose of these tariff-reducing trade treaties is much more about gathering political coalitions to break through public-choice failures resulting in (overall welfare reducing) protectionist policies taken by each side.
Markets => competition => lower price.