在美国，移民在人口中所占比例每增加一个百分点，本土出生的人口生活水平就会提高0.05%。

In America, a one-percentage point increase in the proportion of immigrants in the population made the native-born 0.05% better off.

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而在黑麦和大麦大获丰收的年头出生的人口后来几乎100%都繁衍了后代。

Whereas in years with bumper crops of rye and barley, nearly 100 percent of the people born that year went on to reproduce.

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非本国出生的人口在很多西方国家急剧增加，比例超过10%：包括以前的移民输出国希腊和爱尔兰。

The proportion of foreign-born people in many Western countries has surged well above 10%: this includes Greece and Ireland, from where emigrants used to leave.

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