Consider a case of possible price discrimination: lunch specials at restaurants. Some restaurants may offer a soup and salad for five dollars during lunch hours and offer the same dish for eight dollars during dinner hours. Suppose that the soup and salad is the cheapest dinner option, and that the restaurant, although usually only half full during lunch hours, is often full enough during dinner hours that people end up choosing to eat elsewhere because of the wait.

In what way might this difference in prices not be price discrimination?