Demand Specification for Municipal Water Management: Evaluation of the Stone-Geary Form

Sylvestre Gaudin, Ronald C. Griffin and Robin C. Sickles


To specify demand in most water allocation problems, researchers face a tradeoff between flexibility and parsimony. Flexible forms are less constraining on elasticity estimates, but require large parameter sets that tend to cause poor out-of-sample forecasts and computational difficulties. Using a five-year panel of Texas municipalities, the parsimonious Stone-Geary form yields estimated demand functions that are comparable to flexible form results. The Stone-Geary specification also provides an estimate of the portion of water use that may not be responsive to price, and is useful in analysing price structures and designing conservation policies. (JEL Q25, C23)