Another type would simply be the power of failing students when they don't perform at an acceptable level. When I taught my online classes this summer, I noticed something interesting: I couldn't always tell the difference between foreign students and American born students in terms of their writing. When I teach a class in a physical setting, I can detect right away if a foreign student is having difficulties reading and writing at an abstract level of English, and naturally enough I'll be lenient on them as a I grade them because I know they're dealing with a second language. To me that's fair. But many of our American born students write as if they are foreigners. In my online class, I couldn't decide in many cases if I should be lenient or not because there was no certain proof which kids were which!!
Anyway, I think when American born students write so badly, and show so little effort in reading their texts, that I can't even tell for sure if they're foreign or not in an online class, I think it's exactly these students who should be failing. I've had students complain when I give them C's or D's and they've only completed half of their assignments, when in truth they should be failing at 50%! So if we were allowed to fail more of our students, and they knew that their future plans were in the balance, my guess is that they would work much, much harder and actually earn their A's and B's. But in many American colleges if faculty give out too many C's or below, they could lose their jobs. I would much rather instill fear into our students, in one way or another, to motivate them to stop being so apathetic, lazy, incredibly dumb, nearly illiterate, spoiled, and distracted.
But as I know I can't change the system, I tell my students on the first day of classes that I have no hope of reaching out to them, and if they want to do well in life they shouldn't trust the education system or the grades they receive, but instead they should take it into their own hands if they want to make something of themselves or not. I usually get a good laugh out of this because they already know it's true.