28 Avril 2014 - Séminaire externe - Simon Porcher - Efficiency and Equity in Two-Part Tariffs : The Case of Water Rates

Date de publication : 18 déc. 2015 16:03:07

Abstract: As first noticed by Coase (1946), a standard result in utility regulation is that effi- ciency requires two-part tariffs with marginal prices set to marginal costs and fixed fees equal to each customer’s share of fixed costs. Residential water customers in France face marginal prices for water that average about 8% more than marginal costs. Under price elasticity estimates that are consistent with previous results in the literature, efficiency costs represent around 8 million euros of welfare losses for 2008. Even though the im- pact is fairly small, current price schedules are an important pre-existing distortion which should be considered when evaluating current taxes aimed at addressing external costs. Moreover, efficiency gains from reformed tariffs could be used to fund water assistance programs focused on financially stressed households.