Since the emergence of 18th century classical economics, economists have accustomed to taking "private man" as the human behavior paradigm.

从18世纪古典经济学产生以来，经济学家就形成了把“自私人”作为人类经济行为的范式。

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Since the emergence of 18century classical economics, economists have accustomed to taking "private man" as the human behavior paradigm.

从18世纪古典经济学产生以来，经济学家就形成了把“自私人”作为人类经济行为的范式。

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So we should be good from now on is to make good conduct necessary to become a habit, so that our excellent behavior be accustomed to, become our second nature.

所以我们要变得优秀从现在起就要把优秀所必须的品行变成一种习惯，使我们的优秀行为习以为常，变成我们的第二天性。

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