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[EN] The objective is to evaluate whether bean prices present volatility clustering effects and whether these have implications for the food security of the population. Symmetric and asymmetric models belonging to the ARCH family were used. They were applied to three bean varieties for eight Mexican markets. The results showed a high persistence of volatility in pinto and black beans, the persistence is bigger in local markets than in those with different point of origin and destination. The volatility of the three varieties impacts on the consumption decisions of the most disadvantaged population., [ES] El objetivo es evaluar si los precios del frijol presentan volatilidad y si tiene implicaciones en la seguridad alimentaria de la población. Se aplicaron modelos simétricos y asimétricos de la familia ARCH a tres variedades de frijol en ocho mercados mexicanos. Los resultados mostraron una alta persistencia de volatilidad en frijol pinto y negro, la cual es mayor en los mercados locales que en los que tienen diferente punto de origen y destino. Por lo que dicha volatilidad impacta sobre las decisiones de consumo de la población más pobre., Esta investigación fue posible gracias al financiamiento del Programa de Becas Posdoctorales de la UNAM mediante la adscripción de la Facultad de Economía.

This study examined the impact of agricultural transfers (TA) on the measured perform-ance of the agricultural sector through agricultural value added per worker (VA), for which the TA were differentiated according to their purpose. Series data for the period 1986 to 2010 were used two semi-log-arithmic models. The results indicate that the TA on public goods are the most effective for each dollar invested in this field the VA grows at 1.6 %, the categorization indirect production development recorded investment in the best impact per dollar spent, the VA grows 7.6 %.