(TUE) Why do theatres discount prices on spare tickets just before a performance wheras airlines and rail companies raise prices for last minute cust.

Why would they be different even though they are selling same tickets to customers?
It is a very easy answer, if you think little bit careful about our life examples.
For example, normally those tickets that they sell at the last minute from the theaters are those which are gonna be useless after that show or performance. So those theaters-related people want to sell those tickets by even lowering the price. On the other hand, airplane tickets and rail companies are business which are related to time travel, which means that by having that one last ticket it would change someone`s important issues. For example, airplane company are less affected whether selling the last ticket or not than theaters` company. Because it is not like that they are having flight schedules on certain days of the year, but they regularly have flights for the same destination. For example, airplane companies does not really bother if they sell the ticket to Korea on Monday or next Friday, because at least they are selling it someday. But for the customers who are in real emergency who need to go abroad for really bad or good reason, then it matters for them. So the last minute ticket from the airplane and rail company gets more expensive as it comes to the D-day. While the last minute ticket for the performance in the theater gets lower.