Please help me with these questions

31. Constant returns to scale are said to exist when inputs are increased by some percentage and

output increases by a(n) __________ percentage, causing unit costs to __________.

a. Greater; fall

b. Smaller; fall

c. Greater; rise

d. Smaller; rise

e. Equal; remain constant

32. If quantity demanded rises by 10 percent as price falls by 4 percent, the price elasticity of

demand equals

a. 0.40.

b. 2.50.

c. 0.04.

d. 14.00.

33. A price ceiling is a government-mandated

a. Minimum price below which legal trades cannot be made.

b. Maximum price above which legal trades cannot be made.

c. Minimum price above which legal trades cannot be made.

d. Maximum price below which legal trades cannot be made.

34. Which of the following is true?

a. Buyers always prefer lower prices to higher prices.

b. Buyers never prefer lower prices to higher prices.

c. Buyers rarely prefer lower prices to higher prices.

d. None of the above.

35. At a price above the equilibrium price, there is

a. A shortage.

b. A surplus.

c. Excess demand.

d. Super-equilibrium.

36. Points that lie outside (or beyond) the PPC are

a. Attainable.

b. Unattainable.

c. Efficient.

d. Inefficient.

37. Being too big a firm can be per se violation of antitrust laws.

a. True

b. False

38. With a constant opportunity cost between goods A and B, the PPC for goods A and B would

a. Be a straight line.

b. Be a bowed-outward line.

c. Be a bowed-inward line.

d. Not exist.

39. At the optimal or efficient level of an activity, the activity's marginal benefit must

a. Be zero.

b. Be greater than zero.

c. Equal the marginal cost of the activity.

d. Exceed the marginal cost of the activity.

40. Which of the following statements is false?

a. There are always opportunity costs to making choices.

b. Because of scarcity, choices must be made.

c. Elementary education at public schools is not free.

d. When government builds a new highway, taxpayers end up with less of some of the

things they would otherwise have.

e. None of the above.