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We become steadily more specialised in what we produce, and steadily more diversified in what we consume.
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We move away from precarious self-sufficiency to safer mutual interdependence.
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It cant bee seen in other species.
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By concentrating on other serving people’s needs for 40 hours a week - which we call a job - you can spend the other 72 hours(Not counting 52 hours in bed) drawing upon the services provided to you by other people.
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Innovation has made it possible to work for a fraction of a second so as to be able to afford to turn on an electric lamp for an hour, providing the quantity of light that would have required a whole day’s work if you had to make it yourself by collecting and refining sesame oil or lamp fat to burn in a simple lamp, as much of humanity did in the not so distant past.