Negative Externalities

Now let’s suppose that aluminum factories emit pollution. For each unit of aluminum produced a certain amount of smoke enters the atmosphere. Because this smoke creates a health risk for those who breathe the air it is a negative externality. How does this externality affect the efficiency of the market outcome.

Because of the externality the cost to society of producing aluminum is larger than the cost to the aluminum producers. For each unit of aluminum produced the social cost includes the private cost of the aluminum producers plus the costs to those bystanders affected adversely by the pollution. The social cost of producing aluminum. The social-cost curve is above the supply curve because it takes into account the external costs imposed on society by aluminum producers. The difference between these two curves reflects the cost of the pollution emitted.

What quantity of aluminum should be produced. To answer this question we once again consider what a benevolent social planner world do. The planner wants to maximize the total surplus derived from the market the value to consumers of aluminum minus the cost of producing aluminum. The planner understands

however that the cost of producing aluminum includes the external costs of the pollution emitted.

The planner would choose the level of aluminum production at which the demand curve crosses the social-cost curve. This intersection determines the optimal amount of aluminum from the standpoint of society as a whole. Below this level of production the value of the aluminum to consumers as (measured by the height of the demand curve) exceeds the social cost of producing it (as measured by the height of the social-cost curve). The planner does not produce more than this level because the social cost of producing additional aluminum exceeds the value to consumer.

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