The aid effectiveness literature: The sad results of 40 years of research

The aid effectiveness literature (AEL) consists of empirical macro studies of the effects of development aid. By the end of 2004, it had reached 97 econometric studies of three families, which have been analyzed in one study for each family using meta-analysis. The AEL is an ideal subject for meta-analysis as it uses only a few formally similar models which try to catch precisely the same effects. Also, it is an area with strong beliefs – often generated by altruism – and interests. In this survey of the AEL, we shows that when the whole of the literature is examined, a clear pattern emerges in the results: after 40 years of development aid, the evidence indicates that aid has not been effective. We show that the distribution of results is significantly asymmetrical in a way that reflects the reluctance of the research community to publish negative results. The Dutch Disease effect of aid has been ignored but is a plausible explanation for aid ineffectiveness.