If a firm is earning a profit, then:
A. the ATC must be higher than the market price.
B. total revenue must be higher than total cost.
C. the ATC must be higher than AR.
D. MR is equal to MC.
B. total revenue must be higher than total cost.
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The population growth rate tends to be higher in developed countries than in developing countries
a. True b. False Indicate whether the statement is true or false
Suppose that a new drug has been approved to treat a life-threatening disease. The demand for that drug is shown on the graph below. Prior to approval of this drug, the only treatment for this condition was any one of several non-prescription, or over-the-counter, pain relievers. The demand for one brand of the several non-prescription pain relievers is also shown on the graph. 
A likely reason for the difference in the slopes of the demand curves is that:
A. one market is in equilibrium and the other is not. B. the over-the-counter pain reliever has many substitutes, but the new drug does not. C. one drug is heavily regulated by the Food and Drug Administration and the other is not. D. one drug is new on the market, but the other has been available for a long time.
Calculate MPS.
Suppose there are only two kind of cars in the market for used cars: lemons and good cars. A lemon is worth $1,000 both to its current owner and to anyone who buys it. A good car is worth $8,000 to its current and potential owners
Buyers can't tell whether a car is a lemon until after they have bought the car, and there is no warranty. What is the prevailing price of a used car? A) $8,000 B) $1,000 C) $4,500 D) The prevailing price depends on how many lemons and how many good cars are traded.