The empirical literature has not reached a conclusion as to whether foreign direct investment (FDI) yields spillovers when the host economies are emerging. Instead, the results are often viewed as conditional. For macro studies, this means that the existence and scale of spillover effects is contingent on the levels of institutional, financial or human capital development attained by the host economies. For enterprise level studies, conditionality relates to the type of inter-firm linkages; forwards, backwards, or horizontal. In this paper, we conduct a systematic meta-analysis on emerging economies to summarize these effects and throw light on the strength and heterogeneity of these conditionalities. We propose a new methodological framework that allows country-and firm-level effects to be combined. We handcollected information from 175 studies and around 1100 estimates in Eastern Europe, Asia, Latin America and Africa from 1940 to 2008. The two main findings are that: (a) "macro" effects are much larger than enterprise-level ones, by a factor of at least six; and (b) the benefits from FDI into emerging economies are substantially less "conditional" than commonly thought. Absorptive capacity and the effects of foreign direct investment and equity foreign portfolio investment on economic growth, European Economic Review, 48(2), 285-306.