Here.  A reader also flags PSU's President Ann Cudd's "explanation" of why big classes are better than small classes:

Because nobody likes to be in a class that has only about four or five other students, because if you don’t show up you really are noticed, for one thing. But the other thing is that it’s all on you and a couple of others to carry on the discussion and actually, you know, work together. So it’s a better classroom experience when there are more students than that.

Just to be clear, the President of a University, a philosopher no less, is actually arguing that bigger classes are better, in part, because it's easier for students to skip class.   Source.