As Hillel Rapoport of the Paris School of Economics and his co-authors have shown, controlling for other determinants of trade, countries trade more with, and invest more in, the diasporas’ home countries. In recent work with Dany Bahar, Rapoport has also shown that countries become good at making the products that their migrants’ home countries are good at making.
但跨种族网络的影响仍与以往一样重要。巴黎经济学院的西里尔·拉波波特（Hillel Rapoport）与他的合作者证明，控制其他贸易决定因素，各国与侨民祖国进行更多的贸易和投资活动。在于丹尼·巴哈尔（Dany Bahar）合著的最新文章中，拉波波特还证明，各国会变得擅长制造移民祖国所擅长制造的东西。