What can we do as faculty to make tuition more affordable for students? Do we have an obligation to make tuition more affordable? The inflation rate of tuition in the US has been higher than the general economy's inflation rate for some time, sometimes it is twice as high   What can the faculty do to stop/slow this down?
Use OERs instead of a commercial textbook! This wouldn't affect tuition, but it means students have more money to eat, pay rent, etc.

If you have any say about which texts/materials are used in your classes, then you can be directly responsible for saving students a lot of money.