It is not a discovery made by these authors that the theories of praxeology cannot be refuted by experiments nor confirmed by their successful employment in the construction of various gadgets.

行为学的一些理论，既不能由实验驳倒，也不能因为可以应用来制造些新事物而得到确认。

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Part I the review of the theories and policies related with employment of people with disability.

文章第一部分是对残疾人就业相关理论以及残疾人就业政策法规的梳理。

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The first part is the introduction, introduces the background of putting forward the problem and the original theories of the informal employment.

第一部分非正规就业概述，介绍了问题的提出背景以及非正规就业的理论渊源。

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Alan Krueger, a Princeton University labour economist now at the Treasury Department, has two theories for the divergence in employment between large and small firms: one is that large firms have a lot of fixed costs invested in the training of their employees, and are more reluctant to lay them off.

ECONOMIST: Jobs and businesses