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“The division of
labour, from which so
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many advantages
are derived, is
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not originally
the effect of any
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human wisdom… It is the
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necessary, though
very slow and
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gradual
consequence of a certain
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propensity in
human nature … the
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propensity to
truck, barter, and
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exchange one
thing for another.”
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-- The Wealth
of Nations (21)
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