农业提供了更加可依赖的粮食来源，使人口增长；最终过多的人口迁移到新的土地。

Agriculture provided a more dependable source of food, causing populations to increase; eventually excess population migrated to new lands.

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通过提高农民工子女的教育质量，这种人口迁移模式也有利于长期的生产率增长。

By improving the quality of education of children of migrants, such a migration pattern will also be good for long term productivity growth.

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一些研究推测非洲经济增长的三分之一都归功于人口迁移。

Some studies reckon that demography explains as much as a third of Asia's economic growth.

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