Which of the following suggests that private markets can be effective in dealing with externalities?

When the Rent-A-Limo Company negotiates its new labor contract it finds that the wages it must pay drivers have increased

How does this wage hike affect the Rent-A-Limo Company's average fixed cost, average variable cost, average total cost, and marginal cost?

If the short-run Phillips curve were stable, which of the following would be unusual?

a. an increase in government spending and a fall in unemployment b. an increase in inflation and a decrease in output c. a decrease in the inflation rate and a rise in the unemployment rate d. a decrease in the money supply and a rise in the unemployment rate.