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A marketable permit is a system that allows firms to buy, sell, or trade permits representing the right to emit a specific amount of pollution (or any other external cost generating material). Tradable permits set an overall cap on the total amount of emissions allowed while giving individual firms the flexibility to determine their own emissions levels. This creates a market in which firms can buy and sell permits, creating an incentive for them to innovate and reduce external costs.

In a marketable permit system, the government or any regulatory authority first sets an overall cap on the amount of allowed external cost (e.g. pollution) for a specific industry. They then distribute permits, which represent the right to emit a certain amount of the external cost-causing substance (e.g., pollution) to the member firms. Companies that can easily reduce emissions can sell their permits to less efficient firms. This creates a market and sets a price for the permits based on supply and demand.

Marketable permits create multiple incentives for firms to account for external costs. Firstly, firms have a financial incentive to reduce emissions, as selling unused permits can generate revenue. The more efficiently a firm can reduce its emissions, the more permits it can sell to other firms. Secondly, as the demand for permits increases, their market price also rises. As the cost of a permit becomes higher, there is an increased incentive for firms to reduce emissions, as this would decrease their overall cost of holding permits.

Marketable permits offer several advantages compared to other regulatory measures. Firstly, they allow firms flexibility in deciding their own emissions levels based on their specific context, instead of requiring firms to follow a one-size-fits-all approach. Secondly, the system encourages innovation, as firms are more likely to invest in new technologies to reduce emissions if this can provide them with a financial benefit (i.e., selling permits). Lastly, marketable permits can be more cost-effective for governments to implement, as firms bear the costs of reducing emissions and governments do not need to continuously monitor and enforce the regulations. The system is dynamic, and the market adjusts itself to account for external costs. By understanding the concept of a marketable permit and how it works, we have explained the incentives and advantages it offers for firms to account for external costs. Marketable permits are an effective tool in fixing market failures caused by externalities, providing both financial and environmental benefits.