Origin of the Issue: in the quest for truth by probing into human nature and behavior, self dignity is always held as a center value or center interest of individual.

论题的缘起：在探求人性和人类行为的真理之过程中，自尊一直被奉为人类的核心价值或个人利益之中心。

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Transaction rents results in the emergence of exchange and the division of labor because of human nature of self - interest.

由于交易租金的存在，人们的趋利本性促使相互交易并产生分工。

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Supply side economics invokes the most basic element of human nature: self-interest.

FORBES: The Problem With Supply-Side Economics

As Boudreaux notes in his Wall Street Journal appreciation, Buchanan saw the fundamental problems of social cooperation as problems of identifying and implementing constraints that would channel self-interest toward socially beneficial results rather than parts of a project of remaking human nature.

FORBES: Order, Prosperity, and Hard Work: Appreciating James Buchanan (1919-2013)