Comportement du consommateur et produits biologiques : le consentement à payer pour la caractéristique biologique

The aim is to study the demand for organic products and to determine the consumers? willingness-to-pay (WTP) for the organic characteristic. An Almost Ideal Demand System is used to estimate the demand for organic products. We obtain observed data (scanner data) thanks to the co-operation with Auchan distribution group, then we use an indirect valuation method based on invariance situations of the expenditure function to calculate the willingness-to-pay. Classification JEL : C53, D12, Q10