这些成本随着工资上升而上升，抑或随着生产率（每一工人使用的劳动工具数）的下降而下降。

These costs go up when wages riseor productivity (widgets per worker) falls.

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反对流动工人增加的人认为这会导致犯罪率升高，从而危害社会稳定。

Those who object to the rising migrant population argue that increasing numbers lead to rising crime rates and harm social stability.

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中国的犯罪率显著升高有很多原因——城区大量流动工人的涌入；社会价值的贬低以及贫富之间日益扩大的差距。

The marked increase in China's crime rate-the dramatic influx of itinerant workers in urban areas; declining social values; and widening disparities between the haves and have-nots.

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