Most analysts focus on Labour productivity, which is usually calculated by dividing total output by the number of workers, or the number of hours worked.
因此，许多分析人士着眼于劳动生产率，通常来讲就是用总产出除以全部的劳动人口或者劳动时间来计算。
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Since carbon dioxide enhances photosynthesis, some scientists have calculated that higher concentrations in the atmosphere would increase the productivity of crops and forests.