If the marginal external cost of building a children's playground equals zero, then the i. marginal private cost equals the marginal social cost. ii. marginal social cost equals zero. iii. marginal private cost equals zero

If Americans became more pessimistic about the economy, what would happen to the consumption-income line?

a. A rightward movement along the line b. A leftward movement along the line c. The entire line would shift upward d. The entire line would shift downward e. The entire line would shift downward and there would be a rightward movement along the new line

In oligopoly, the actions of one firm have a perceptible effect on the other firms.

Answer the following statement true (T) or false (F)