enquête (1) simulation (1) prix (1) association (1) azote (1) modèle (1) affectation des sols (1) revenu (1) ménage (1) ferme (exploitation) (1) élasticité (1) demande (offre et demande) (1) coût (1) consommation (1) Area (1) Surveys (1) Exploitation (1) Area (1) Surveys (1) Social groups (1) Prices (1) Political science (1) Nitrogen fertilizers (1) Nitrogen (1) Manufacturers' agents (1) Land use (1) Income (1) Households (1) Finance (1) Farms, Small (1)