The figure above shows the marginal social cost curve of generating electricity, the marginal private cost curve, and the demand curve. The marginal external cost of producing 200 billion kilowatt hours per day is ________ per kilowatt

Aggregate demand is

A) the horizontal summation of all demand curves for a product. B) the sum of all planned expenditures for the economy. C) the total quantity of all goods sold in an economy in a year. D) the horizontal summation of all demand curves for state, local, and federal governments and business firms.

Assuming that travel from New York to Los Angeles is a normal good, a decrease in consumer income, other things being equal, will:

a. decrease the quantity demanded of travel to Los Angeles. b. increase the demand for travel to Los Angeles. c. decrease the demand for travel to Los Angeles. d. increase the quantity of travel to Los Angeles demanded.