1. Is the opportunity cost of providing a hotel room today determined by the cost to construct, maintain and operate it or by what someone else would be willing to pay for that room today? 2. Why would profit-seeking airlines not find it in their interest to use earnings from profitable routes to subsidize unprofitable routes? 3. If Los Angeles to Indianapolis passengers were being unfairly gouged by air fares, wouldn't you expect other airlines to begin flying such a remunerative route? 4. How can differences in competition on routes lead to it being cheaper to fly from Los Angeles to Pittsburgh by booking a Los Angeles to New York flight with a stopover in Pittsburgh, and getting off in Pittsburgh, than to book a direct flight from Los Angeles to Pittsburgh (the so-called hidden city strategy)