Une étude publiée sur Vox évalue les effets (positifs) des IDE aux Etats-Unis :
The US has once again ranked among the top two recipient countries for foreign direct investment. This column examines the effects of these large FDI inflows on the US domestic economy. Foreign multinationals are – alongside US-headquartered American multinationals – the most productive and highest-paying segment of the US economy. In addition, they provide positive spillovers to US firms. About 12% of the total productivity growth in the US from 1987 to 2007 can be attributed to productivity spillovers from inward FDI.