The aggregate demand curve is directly derived from the expenditures schedule.

Refer to the table above. What is the firm's marginal cost when it produces 155 units of the good?

A) $0.66 B) $1 C) $1.33 D) $1.50

Slowdonia's current growth rate of real GDP per person is 1 percent a year. Approximately how long will it take to double real GDP per person?

A) 10 years B) 35 years C) 70 years D) 100 years