That's why I qualified and said "either formally or not". When I grade exams, I try to create some spread between the students. No one said that the curve has to have a "bell" shape. It is common now a days to have 40% A's, 45% B's and 5% C's - this a curve. Seminar and small classes are different - but beyond 30 studnets one would like to have some differences between the grades. Agreed.