A pin factory with 10 workers who do the professional operation of their own (one who specializes pull wire, a bent for straight people, the third person cut the rope into small fragments, ..) will produce 50,000 pins per day. If a self-made pins, one day he could produce only a few units is the maximum (Adam Smith, The Wealth of Nations). This example has a great effect to tell the difference between collective and individual, between specialization and mass.
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