Case Study

Analyzing Unintended Consequences of a Tradable Permit System

A government agency implements a system to control water salinity in a river. A total limit (a 'cap') is placed on the amount of salty water that can be discharged into the river, and permits are issued to industrial firms. These firms can freely buy and sell the permits. Consider the following scenario: Firm A is located upstream, near a freshwater nature reserve that is highly sensitive to salt. Firm B is located 50 miles downstream, near the river's mouth where it meets the ocean. It is very expensive for Firm A to reduce its salty discharge, while Firm B can do so at a very low cost. Based on this information, analyze a potential negative environmental outcome of this permit system, even if the total amount of discharged salt stays below the legal cap.

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Updated 2025-10-07

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