Final Answer:
(a) Optimal Emissions Charge: $4 per unit; Polluter 1 abates 6 units, Polluter 2 abates 2 units.
(b) Optimal Emissions Subsidy: $1 per unit; Polluter 1 abates 4 units, Polluter 2 abates 2 units.
(c) Cap and Trade Program: 24 permits issued; Polluters abate 18 units (Polluter 1 sells 2 permits to Polluter 2).
(d) Most Cost-Effective Policy: Cap and trade, allowing market flexibility, achieves the goal with the lowest total abatement cost.
Step-by-step explanation:
In the case of an emissions charge, the government aims to set a price that internalizes the external cost of pollution. The optimal emissions charge (P*) is determined where the sum of marginal abatement costs equals the government's abatement goal. In this scenario, P* is 4 units, and Polluter 1 abates 6 units, while Polluter 2 abates 2 units.
When using an emissions subsidy, the government incentivizes polluters by providing financial rewards for abatement. The optimal subsidy (S*) is set where the sum of marginal abatement costs equals the abatement goal. Here, S* is 1 unit, leading Polluter 1 to abate 4 units and Polluter 2 to abate 2 units.
In a cap and trade program, the government issues permits equal to the abatement goal. With Polluter 1 and Polluter 2 each receiving 12 permits, they abate units based on their marginal abatement costs. Polluter 1 sells 2 permits to Polluter 2, resulting in both abating 18 units.
Comparing the policies, the cap and trade program is the most cost-effective as it allows flexibility, letting the market find the most efficient allocation of abatement efforts, resulting in the lowest total abatement cost.