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We review a research methodology used by Joseph Ziegler and Stephen Bell to estimate demand for own-water by industrial firms—Their claim, that the empirical methodology they use provides evidence for the superiority of an average price specification over a marginal price, is rejected. Although we agree that the issue of price,specification for self-supplying firms remains an important issue, we show that it is inconclusively tested by the Ziegler-Bell methodology. We demonstrate that their results are explainable •as direct consequences of specific model restrictions and variable definitions.


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