This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...al agreement, and are merely the application of these individual rights to a specific undertaking. Every legitimate group undertaking is based on the participants’ right of free association an d free trade. (By “legitimate,” I mean: noncriminal and freely formed, that is, a group which no one was forced to join.)

For instance, the right of an industrial concern to en
gage in business is derived from the right of its owners to invest their money in a productive venture — from their right to hire employees — from the right of the employees to sell their se...
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