4) Airline pricing and Goolsbee and Syverson (2008). a) Considering Table II, what are the authors' findings on the quantities of tickets sold before and after Southwest's entry? b) Are these results consistent with their price results that airlines lowered prices to deter entry? If not, what else could explain these results? c) Suppose the U.S. Department of Justice were trying to evaluate whether the LaGuardia to DFW and JFK to DFW routes were in the same market. What tests would they use to evaluate this? d) How might they implement these tests