Residential Water Demand in Portugal: checking for efficiency-based justifications for increasing block tariffs

Henrique Monteiro ()

No ercwp0110, Working Papers Series 1 from ISCTE-IUL, Business Research Unit (BRU-IUL)

Abstract: The increasing popularity of increasing block tariffs (IBT) for water is reflected in Portugal by a virtually universal implementation for residential use. IBT are often supported as a good tool for achieving the goals of equity, water conservation and revenue neutrality but seldom have they been grounded on efficiency justifications. We test the conditions derived by Roseta-Palma and Monteiro (2008) for IBT to be a second-best pricing practice under water scarcity and budget balancing constraints, when consumers are heterogeneous and the fixed charge is only allowed to cover fixed costs. Because, in these conditions, the choice of tariff schedule design is dependent on the price-elasticity of demand and the way it varies with consumption levels, we estimate the Portuguese residential water demand and show that the resulting recommended tariff schedule hinges crucially on the choice of functional form. After the proper specification test, a choice between a semilogarithmic lin-log and a double-log specifications is left undecided, which does not prove the superiority of IBT, but also does not enable its dismissal. Besides the usual determinants found in the prolific residential water demand estimation literature we find that the proportion of seasonally inhabited dwellings and a reduced water quality on delivery can have a significant negative influence on the amount of water households consume.

Keywords: Water Pricing; Residential Water Demand; Increasing Block Tariffs; Choice of Functional Form; Water Quality (search for similar items in EconPapers)
JEL-codes: C23 C52 D42 Q21 Q25 (search for similar items in EconPapers)
Pages: 145 pages
Date: 2010-01-15
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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