For each of the following examples, explain how and why a monopoly would try to price discriminate.
a. Air transport for businesspeople and tourists
b. Serving food on weekdays to businesspeople and retired people. (Hint: Which group has more flexibility during a weekday to adjust to a price change and, hence, a higher price elasticity of demand?)
c. A theater that shows the same movie to large families and to individuals and couples. (Hint: For which set of people will the overall expense of a movie be a larger part of their budget, so that demand is more elastic?)