This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...ciple of trade is the only rational ethical principle for all human relationships, personal and social, private and public, spiritual and material. It is the principle of justice.

A trader is a man who earns what he gets and does not give or take the undeserved. He does not treat men as masters or slaves, but as independent equals. He deals with men by means of a free, vo luntary, unforced, uncoerced exchange — an exchange which benefits both parties by their own independent judgment. A trader does not expect to be paid for his defaults, only for his achievemen...
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