This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...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
nt men in a rational, productive, free society. Parasites, moochers, looters, brutes and thugs can be of no value to a human being — nor can he gain any benefit from living in a society geared...
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