Imagine a world defined by largely autarkic cities, states and countries. In such a world, wildly primitive living conditions and immense poverty would be the sad norm.
That it would be is no revelation. The simple truth is that that the more hands and machines working together in the production of goods and services, the exponentially more goods and services available at prices that decline day after day, and year after year. Put more plainly, living standards would be a tiny fraction of their abundant present absent a globalized division of labor.
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