This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...have some valid claim and some value to offer each other. And this means that both parties agree upon some fundamental principle which serves as a base for their deal.

It is only i
n regard to concretes or particulars, implementing a mutually accepted basic principle, that one may compromise. For instance, one may bargain with a buyer over the price one wants to receive fo r one’s product, and agree on a sum somewhere between one’s demand and his offer. The mutually accepted basic principle, in such case, is the principle of trade, namely: that the buyer must ...
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