Résumé
This paper studies the wine producers' response--this choice of a wastewater abatement technology--to the use of economic instruments defined by the Water Agency in the south of France. It is assumed that the producers/polluters behave rationally and minimise their pollution control costs. In the second part of the paper, we will look at the individual firm, underlying the importance of fixed costs for the choice of a wastewater control strategy. Consequently we will propose a modified model of polluter's behaviour in which fixed costs are considered and the underlying cost function follows the law of diminishing returns. The analysis of the individual choice between bearing pollution abatement costs (technical investment) and paying pollution costs (taxes) allows us to examine, in addition, the possibility of a partial treatment of wastewater.