2024-11-03-未来能源研究所-城市水价中的效率_公平和成本回收权衡（英）_62页_1mb

Analysis Summary

This document analyzes the efficiency, equity, and cost-recovery trade-offs in municipal water pricing. The theoretical framework, based on Coase’s model, suggests that water prices should equal marginal costs with fixed costs recovered through fixed fees or alternative taxes. However, empirica数据 from over 700 utilities in the Southeastern United States show that prices often deviate from this ideal, particularly with nonlinear rate structures, leading to inefficiencies and budget deficits.

Key Findings

1. Inefficient Pricing: Utilities commonly use nonlinear rates (e.g., increasing block rates) with significant discounts for low consumption, resulting in allocative inefficiencies and revenue shortfalls, especially in smaller and poorer communities. These discounts are larger in areas with higher low-income populations, creating an efficiency-equity trade-off.
2. Marginal Cost vs. Average Cost: Utilities price water below average cost for low consumption tiers, with markups varying widely by utility size and socioeconomic factors. Marginal costs are estimated using operating expenditure and quantity supplied data, showing discounts below marginal costs in low tiers and markups above in fewer tiers.
3. Revenue Elasticities: Price increases lead to revenue gains (elasticity of 0.5–0.7), implying inelastic demand. Marginal-cost pricing increases revenue and eliminates deadweight loss but may reduce consumer surplus.
4. Welfare Effects: Switching to marginal-cost pricing reduces consumption and deadweight loss, but utilities with uniform rates see modest increases, while those with "uniform plus free" rates experience significant welfare increases. Nonlinear rates increase consumer surplus loss by up to $158 per customer annually.

Conclusion

Municipal water pricing often deviates from marginal-cost pricing due to equity considerations, leading to inefficiencies and welfare losses. The recommended approach is to adopt marginal-cost pricing with fixed costs covered through progressive fixed fees or alternative municipal revenues, ensuring equitable outcomes without distorting efficiency.