Food and environmental policies in Africa.
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"The untested premise of trade liberalizing U.S. development programs such as the Caribbean Basin Initiative is that commodity trade can substitute for international labor migration. Analysis of U.S. tomato producing regions in Sinaloa, Mexico and Florida suggests that the effect of trade liberalization on international labor migration is uncertain." The emphasis is on how such development projects might affect the flow of illegal migrants to the United States.
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"This article is a contribution to the discussion on theories about household formation and marriage in Italy in the 1880s. Based on data [from] the 1881 census, it aims at verifying some hypotheses on the interdependence between marriage behaviour and socio-economic and environmental factors, by using some multivariate statistical techniques. The authors propose a number of indicators and analyse their correlation matrix, before reducing the variables to a few relevant factors which summarize a major part of the available information. Such factors are employed to determine homogeneous areas for marriage behaviour. Finally, they propose and measure some causal relationships between variables within two of the previously identified areas." (SUMMARY IN ENG AND FRE)
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In this paper, Pontryagin's principle is proved for a fairly general problem of optimal control of populations with continuous time and age variable. As a consequence, maximum principles are developed for an optimal harvesting problem and a problem of optimal birth control.
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