Why does every village, city, state, country, and empire need to trade with entities external to itself to be economically viable, survive, and grow, but the Earth itself does not?
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There will always be someone that can produce a particular thing cheaper than you can—just because they’re better at it. That also means that you’ll be able to produce something cheaper than everyone else. While you can choose to produce anything and everything yourself, it would be cheaper and more efficient if you stuck with what you’re good at and traded the excess for everything else you need from the people who make those things the cheapest. Hope I helped.
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