We explore the effect of foreign direct investment (FDI) on economic growth, distinguishing between mergers and acquisitions (M&As) and “greenfield” investment. A simple model underlines that, unlike greenfield investment, M&As partly represent a rent accruing to previous owners, and do not necessarily contribute to expanding the host country's capital stock. Greenfield FDI should therefore have a stronger impact on growth than M&A sales. This hypothesis is supported by our empirical results that are based on a panel of up to 127 industrialized, emerging, and developing countries over 1990 to 2010.