This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... the division of labor: it enables a man to devote his effort to a particular field of work and to trade with others who specialize in other fields. This form of cooperation allows all men who t ake part in it to achieve a greater knowledge, skill and productive return on their effort than they could achieve if each had to produce everything he needs, on a desert island or on a self-sus taining farm.

But these very benefits indicate, delimit and define what kind of men can be of value to one another and in what kind of society: only rational, productive, independe...
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