When an economy is at full employment, the unemployment rate is zero percent

If Y = $500 billion, autonomous consumption = $300 billion, and the marginal propensity to save = 0.20, then saving will equal:

a. ?$200 billion. b. $200 billion. c. ?$100 billion. d. $100 billion. e. $40 billion.

From an economic standpoint, the amount of pollution should be

A) zero. B) the amount that allows firms to maximize profits. C) the amount where firms are earning a normal rate of return on investment. D) at the point at which the marginal benefit from further reduction equals the marginal cost of further reduction.