Résumé :
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A principal-agent model is developed to examine the effect of private information about the cost of put landinto cultivation on the design of voluntary-based incentive contracts with farmers for conserving biodiversity in forested areas in developing countries. Through thes contracts, farmers agree to set aside still wwoded plots and receive to get all forested lands owners to accept a contract. Furthermore, in the contract schedule, a specific restrictio, called "consistency constraint", is imposed by which farmers commit themselves not to cultivate more forest plots. Hence, some farmers may receive transfer payment while not changing their current use of land. However, their proportion decreases when the social benefit from biodiversity conservation increases.
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