My experience is that it's not a problem when a teacher doesn't know some particular fact from memory as long as he can say "I'll get back to you on that," and

My experience is that it's not a problem when a teacher doesn't know some particular fact from memory as long as he can say "I'll get back to you on that," and subsequently go and look it up. I suspect the people falling into the college debt trap are by and large not doing so because they couldn't do the math. I suspect they are doing so because they didn't realize in the first place that they should make the decision with the part of their brain that does math calculations rather than the part that does social status calculations.