Does Europe need mass immigration?
研究欧洲在零移民情景下的人口下降和劳动力老龄化对生产率和创新的负面影响，结论认为欧洲需要大量移民以维持合理的经济增长。
Europe has received a high net inflow of immigrants since the beginning of this century, but with the economic crisis restrictive policies are being put in place in many countries, and several countries are considering a zero-migration option. Between 2015 and 2050—with zero migration—population would decline in most countries and so would the active population even in the case of increase of activity rates and extension of the retirement age. Moreover the considerable aging of the working population will depress productivity and the rate of innovation. The paper's conclusion is that Europe will have to attract considerable inflows of immigrants in order to sustain a reasonable pattern of growth.