This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...reater his knowledge, the longer the range of his planning. The higher or more complex a civilization, the longer the range of activity it requires — and, therefore, the longer the range of co
ntractual agreements among men, and the more urgent their need of protection for the security of such agreements.
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Even a primitive barter society could not function if a man agreed
to trade a bushel of potatoes for a basket of eggs and, having received the eggs, refused to deliver the potatoes. Visualize what this sort of whim-directed action would mean in an industrial s...