transport (1) enquête (1) prix (1) papier (1) besoin (1) modèle (1) revenu (1) ménage (1) analyse (1) aliment (1) dépense (1) énergie (1) science économique (1) coût (1) biens et services (1) budget (1) Food (1) Costs (1) Case (1) Transportation (1) Tops (1) Prices (1) Power resources (1) Power (Mechanics) (1) Paper (1) Income distribution (1) Income (1) Impact (1) Households (1) Grammar, Comparative and general--Case (1)