Migration and invention in the Age of Mass Migration
研究了1870-1940年间移民美国的发明家对当地专利活动的影响，发现移民的知识转移催生了美国地区的新技术领域，并促进了本土发明家的创新。
Abstract More than 30 million people migrated to the USA between late-ninetieth and early-twentieth century, and thousands became inventors. Drawing on a novel dataset of immigrant inventors in the USA, we assess the city-level impact of immigrants’ patenting and their contribution to the technological specialization of the receiving US regions between 1870 and 1940. Our results show that native inventors benefited from the inventive activity of immigrants. In addition, we show that the knowledge transferred by immigrants gave rise to new and previously not exiting technological fields in the US regions where immigrants moved to.