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Agricultural economists' view of duality has often assumed the characteristics of an ambivalent relation. During the eighties, several authors published papers which put in doubt this or that aspect of duality. This study emphasizes the notion that duality is a time-honored approach suitable for solving problems that can be expressed mathematically.(More)
Locust swarms hit subsistence-staple-crop-growing households at random and are not privately controllable. A regional aerial-spraying scheme that supports these households' livelihood at the least cost is proposed. The properties of this scheme are analysed and two steady states are identified. The saddle one is socioeconomically superior to the stable(More)