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The difference between successive total costs can be used to compute the marginal cost. Reducing sewage emissions costs $50,100,350,700$dollars. The marginal benefits are $800,500,550,150$respectively, and can be calculated by subtracting successive total benefits.

Externalities also incurred additional costs in the form of "external costs," lowering equilibrium quantity and raising equilibrium price.

A benefit received from the use of one additional unit of commodity or service is referred to as a marginal benefit.

The marginal cost is the difference in overall production costs as a result of manufacturing one more unit.

We can deduce from the table above that $4MG$is the most ideal sewage level because,

The biggest gap between total cost and total revenue is the most optimal level of sewage.