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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Civilizations discovered it is far more efficient to specialize in producing certain commodities/services and purchase life’s necessities from other likewise specialized economies than to try and do everything alone.
In this way, every country does what it is really good at, an everyone benefits.
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