Between 1994 and 2004, the monthly charge for cellular phone service decreased from $120 per month to $30 per month. At the same time, the number of subscribers increased from less than 10 million to more than 75 million. Which of the following provides the best explanation for these changes?
a. an increase in consumer income between 1994 and 2004
b. a reduction in the price of residential phone service, a substitute for cellular phone service
c. an increase in the wages of workers in the cellular phone industry
d. technological improvements that reduced the cost of supplying cellular phone service
D
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Which of the following would most likely cause a country's production possibilities set to shift outward at every point along the frontier?
A) a decrease in idle capital B) a decrease in unemployment C) a general technological advance that affects all sectors of the economy D) a technological advance in only one sector of the economy E) none of the above
Suppose a monopolistically competitive firm sells 25 units at a price of $10. Calculate its marginal revenue per unit of output if it sells 5 more units of output when it reduced its price to $9
A) $270 B) $20 C) $4 D) $2.50