Refer to the diagram in which S is the before-tax supply curve and S t is the supply curve after an excise tax is imposed. The total amount of the tax paid by producers is shown by area(s):

The benefit from an additional unit of a good or service that the consumer of that good or service receives is the

A) marginal private benefit. B) marginal external benefit. C) marginal social benefit. D) opportunity cost.

Marvin's Metal Company produces screws that it sells to Ford, which uses the screws as a component of its cars. In the national income accounts, the screws are classified as

A) inventory. B) final goods. C) capital goods. D) intermediate goods.