这个“陌生人”，由于其不受控制、不听指令，始终是恐惧的对象、是潜在的抢劫犯、是社会边界外始终让人感觉到威胁的人。

The stranger, because he cannot be controlled and ordered, is always the object of fear; he is the potential mugger, the person outside of society's borders who is constantly threatening.

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他主张将边界作为社会变革的推动者。

He argued for the frontier as an agent of social change.

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欧文·费雪还画了一条曲线，一条社会的生产可能性边界，他让它向下弯曲。

Irving Fisher also drew on the curve, a production possibility frontier for society, which he made downward-curved.

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Irving Fisher also drew on the curve a production possibility frontier for society, which he made downward-curved.

欧文·费雪还画了一条曲线,代表了社会的生产可能性边界PPF,这是一条向下的曲线

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