Many U.S. consumers have switched to wireless phones from traditional telephones. Which factor is affecting demand?

All of the following statements would make a reasonable hypothesis to test except

A) Long-run economic growth leads to higher real GDP per capita. B) An inflation rate below 3% is good for an economy. C) Increasing tax rates eventually lead to a decrease in work effort. D) Decreases in the unemployment rate lead to increases in the rate of inflation.

When entry barriers are low, firms in a competitive price-searcher market

a. can expect many new rivals to enter regardless of current profitability. b. can expect competing firms to enter the market if the activity is profitable. c. can never earn economic profit. d. will always be able to earn economic profit.