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Estimating Residential Water Demand Using the Stone-Geary Functional Form: The Case of Sri Lanka

机译：使用Stone-Geary函数形式估算住宅用水需求：以斯里兰卡为例

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This paper formulates a demand model for residential water in Sri Lanka using the Stone-Geary functional form. This functional form considers water consumption to be composed of two parts—a fixed and a residual component. The presence of these two components means it is possible to estimate a threshold below which water consumption is non-responsive to price changes. In turn, this can provide policy makers with a better understanding of the degree to which price changes will affect water consumption and the extent to which price instruments can be utilised to raise additional revenues. These revenues could then be used to extend pipe-borne water infrastructure to a greater proportion of the population than is currently the case. The findings presented here show the portion of water use that is insensitive to price changes in Sri Lanka is between 0.64 and 1.06 m~3 per capita per month. The results indicate that price elasticity ranges from -0.11 to -0.14 while income elasticity varies from 0.11 to 0.14. Combined, these findings suggest water authorities could raise revenue via price increases to fund critical infrastructure extension.
机译：本文使用Stone-Geary函数形式来制定斯里兰卡居民用水需求模型。这种功能形式认为用水量由两部分组成：固定部分和残余部分。这两个成分的存在意味着可以估计一个阈值，低于该阈值水消耗对价格变化无响应。反过来，这可以使政策制定者更好地了解价格变化对用水的影响程度以及可以利用价格工具增加额外收入的程度。然后，这些收入可以用于将管道水基基础设施扩展到比目前更大的人口比例。此处显示的发现表明，斯里兰卡对水价变化不敏感的用水量为每月人均0.64至1.06 m〜3。结果表明，价格弹性从-0.11到-0.14，而收入弹性从0.11到0.14。综合起来，这些发现表明水务部门可以通过提价来增加收入，以资助关键的基础设施扩建。

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