From June EDI? to June 2018, the price of jet fuel jumped 33%. a. Based on a general Cournot model, use calculus to show how much a marginal change in the marginal cost, m, affects the equilibrium price. b. In 2018, fuel cost was about 23% of airlines' costs. Calculate how much a onethird increase in fuel costs would have affected the equilibrium price in the airline model in this chapter. Why did prices rise less than in proportion to perpassengerperda}? cost? M