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Senegal

Presque au hasard

La « randomisation » – ou application par répartition aléatoire – des programmes d’aide est actuellement considérée comme la « règle d’or » permettant d’évaluer l’impact de chaque projet et de trouver les schémas d’intervention les plus efficaces possible. Des études antérieures ont été critiquées en raison de leur portée limitée, c’est pourquoi des interventions plus récentes portent désormais sur de plus larges échantillons de population.

Almost random

Randomized program implementation is currently seen as the ‘gold standard’ for impact evaluation in the search for the most effective development interventions. Earlier studies were criticized for their limited scope, so some of these interventions now involve large populations. Unfortunately, the larger the intervention, the larger is the danger that people who were supposed to get the treatment do not receive the intervention and vice-versa. Do such deviations invalidate the conclusions drawn from randomized studies? My colleague Harold Alderman together with Harvard economist Sebastian Linnemayr address this question in a paper  that evaluates the impact of a randomized nutrition intervention on the anthropometric status of Senegalese children. The paper confirms that the measured impact is stronger in villages that actually received the intervention compared to those that should have received it. This confirms the view that large scale community based health promotion can get parents to take better care of their children—and that children will benefit from this. The paper illustrates that randomization, even though it was not strictly followed, still assists in identifying the program’s impact.   Given the rapidly increasing number of large-scale randomized interventions, more studies addressing this sort of questions are needed. The most valuable lessons will come from studies that confront these difficulties rather than ignoring them. The real world differs fundamentally from the laboratory setting in which the method of randomized experiments first was developed. It is time to address this fact in order to learn real lessons from and for real people.

Using economics to fight AIDS

I gave one of the keynotes (based on joint work with Markus Goldstein) at the recent ICASA 2008 in Dakar, Senegal on the title of this post. The fight against AIDS involves allocating scarce resources to multiple uses; and contracting, avoiding, preventing, testing for, and treating the disease all involve behavioral choices.

How will the financial crisis affect remittances to Africa?

Sub-Saharan Africa received almost $12 billion in remittances in 2007, and that was only the official number. With "informal" flows added the total amount can easily be double that number. Nigeria, Kenya, Sudan, Senegal, Uganda and South Africa received the highest volume of remittances, while in smaller countries such as Lesotho remittances represent up to a quarter of GDP.

Remittance costs are significantly higher for Africa compared to other regions; costs can go up to almost 25% of the amount remitted. Remittances between African countries (from South Africa, for example) are especially expensive. Reducing these costs will mean substantial extra transfers, and this will be a focus of the World Bank’s medium term agenda on the African financial sector. The immediate concern is, however, stability of flows: the recent international credit crisis will lead to a slowdown in remittances. Remittances have generally been counter-cyclical in the past, as they tend to increase when the receiving country experiences adverse events.

But a recession in sending countries could hurt the capacity of migrants to send money home. It is still too early to determine if the latter factor will dominate and cause a decline in the total amount remitted, although there are some disturbing signs. High-frequency data on remittances for African countries are scarce, but available data show that remittances from the US seem to have slowed down in recent months; remittances from other sending countries, however, have not yet been affected.

Since some readers of this blog are senders of remittances, and others recipients, it would be helpful to hear how you see remittances changing  in the current situation.