The recent wave of randomized trials in development economics has provoked criticisms regarding external validity. We investigate two concerns-heterogeneity across beneficiaries and implementers-in a randomized trial of contract teachers in Kenyan schools. The intervention, previously shown to raise test scores in NGO-led trials in Western Kenya and parts of India, was replicated across all Kenyan provinces by an NGO and the government. Strong effects of shortterm contracts produced in controlled experimental settings are lost in weak public institutions: NGO implementation produces a positive effect on test scores across diverse contexts, while government implementation yields zero effect. The data suggests that the stark contrast in success between the government and NGO arm can be traced back to implementation constraints and political economy forces put in motion as the program went to scale.

Do Kenyans vote according to ethnic identities or policy interests? Based on results from a national probability sample survey conducted in the first week of December 2007, this article shows that, while ethnic origins drive voting patterns, elections in Kenya amount to more than a mere ethnic census. We start by reviewing how Kenyans see themselves, which is mainly in non-ethnic terms. We then report on how they see others, whom they fear will organize politically along ethnic lines. People therefore vote defensively in ethnic blocs, but not exclusively. In Decem-ber 2007, they also took particular policy issues into account, including living standards, corruption and majimbo (federalism). We demonstrate that the relative weight that individuals grant to ethnic and policy voting depends in good part on how they define their group identities, with "ethnics" engaging in identity voting and "non-ethnics" giving more weight to interests and issues.Journal of Economic Literature Classification: D72, D74, D78

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Ethnicity is an important institution and one that impacts on the quality of governance. This paper focuses on the behavior of ethnic groups and specifically on their impact on the provision of public goods. The paper shows that ethnic heterogeneity results in under-provision of non-excludable public goods. On the other hand, such societies associate with provision of patronage goods. The paper proposes some areas of research such the economics of ethnic institutions, empirical evidence of the role ethnic groups on public goods provision, tax compliance and institutional reforms to improve governance.

Most studies of the demand for private education have treated “white flight” as a response to the proportion of the population that is black in a particular area. The present article, by contrast, considers the possibility that this flight may be from poverty rather than race. The article develops an aggregate demand function for private education from which individual behavior may be inferred, and then applies the model to data from Mississippi. The results suggest that prejudice is directed against poor blacks rather than against nonpoor blacks or poor whites.