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Abstract
This paper represents for farmers and public authorities a kind of instrument conceived for decision assistance. It studies wheat in two french departments representative of the french cerealiculture. It is connected with two measures of agricultural policy : pure and simple fallow and energetic fallow. Two approchs are successively utilized : from a certain level of subsidy, we can read on the graphics surfaces and productions which will be eliminated and inversely ; from a certain level of restitution for export, we can define an optimum, that is to say the level of subsidy for which is realised the maximum of economies in the field of PAC expendidures. This optimum depends on degree of productive intensity, on modalities of subsidies distribution and on type of fallow which is envisaged. The energetic fallow of ethanol-wheat provides the best result according to the price of the sold product, price which is positively influenced by détaxation in France of this kind of energy. The éventuel surplus offered by non production or by non food production may be distributed in a manner of creating an interest convergency between european farmer and tax-payer.