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I don't think buying from "first world countries" is always a guarantee that you're getting a more ethically made product though. For example I know that Gildan make (or made, I haven't looked into it for a while) a lot of their t-shirts etc in the US but the people making the shirts are prisoners paid pennies an hour, so effectively slave labour. I'd rather buy a t shirt from a company that pays closer to a living wage in a developing country than one that relies on slave labour from a more developed country.
Food and clothing and many other items are artificially cheap these days. When I can I try to buy from (so-called) first world countries. It requires more research than just that, but that's often my starting point. So many parts of things are made in multiple countries and then assembled somewhere else so it all gets real complicated real quickly. Bottom line I'm trying to buy less.