Most airlines charge a fee to check a bag. Fill in the blanks to complete the passage on price discrimination and airlines.

Airlines can price$-$discriminate by determining people$$s $$

to pay for luggage accommodations in the cargo hold. Some customers are willing to pay a small marginal fee to check a bag for the sake of this convenience, other customers are not. In this way, the airline makes more $$

because it can divide customers into the $$

groups. Those who do not want to pay to check a bag often have $$

demand and will pack everything in a carry$-$on$.$ Customers who have $$

demand for checked luggage will pay to check their bags.