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Este artículo formaliza a través de un mecanismo de principal-agente la política de seguridad democrática del Gobierno de Uribe, y muestra su relación con el incremento de las víctimas de ejecuciones extrajudiciales llamados "falsos positivos". El modelo explica las fallas de la política de seguridad democrática al compararla con una política contrafáctica alterna que involucre un nivel óptimo de auditoría a las unidades militares para evitar falsos positivos. Se encuentra que esta política contrafáctica aumentaría el bienestar de la sociedad.

Using the 1993 South Africa Integrated Household Survey, this paper studies the effect that mother's education through the knowledge channel has on children's health using height for age Z-scores as health measure. Under a two-stage least square methodology we find that an increase in 4 years on mother's education (approximately 1 standard deviation) will lead to an increase of 0.6 standard deviations on her child's height for age Z-score. We also find, as the medical literature suggests, support for the hypothesis that mother's education is more important for children older than 24 months of age. JEL Classification: I12, I21, O15, D1

Using a unique data set from the major Colombian cities collected between 2000-2003 and with information on more than 12,000 households, this paper studies the relationship between the kidnap risk a household faces with its migration decisions. We find evidence that exposure to such risk induces households to react sending some of their members to an international destination but not necessarily to a domestic one. Estimates are robust to the inclusion of several household characteristics usual in the migration literature, other crime risks, reported feelings of insecurity of the household, and an alternative measure of kidnap risk.

The Policy Research Working Paper Series disseminates the findings of work in progress to encourage the exchange of ideas about development issues. An objective of the series is to get the findings out quickly, even if the presentations are less than fully polished. The papers carry the names of the authors and should be cited accordingly. The findings, interpretations, and conclusions expressed in this paper are entirely those of the authors. They do not necessarily represent the views of the International Bank for Reconstruction and Development/World Bank and its affiliated organizations, or those of the Executive Directors of the World Bank or the governments they represent.