3. The airlines use a computerized pricing system, called yield management, to set airfares and maximize their revenues. a. With the use an appropriate model, explain how the yield management system works and how the airlines can use their data to achieve a form of price discrimination. (Value 20 percent) b. As the Covid 19 pandemic began, the number of air passengers dropped dramatically and is only now slowly recovering. The airlines were able to layoff crews and cut flights, but could no longer use the yield management system to set prices. Explain why they had to go back to manually setting airfares. (Value 10 percent)