You can consider comparative advantages, but you either have to say the supply changes or it doesn't change. Which is it?
not only that, it misleeds everyone into thinking that with a removal of subsidies, prices will increase. as you saw on the Adam Smith graphs, this only occurs when the supply is totally subsidized by foreign countries (the mali example.) and that country has no comparative advantage in producing it. in the US cotton example, prices remain the same when subsidies are removed. the difference is where the money is going.
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