The Ivy League/State distinction is a little more subtle than professors' regard for students' futures. At private schools, tuition is much higher, parents are

The Ivy League/State distinction is a little more subtle than professors' regard for students' futures. At private schools, tuition is much higher, parents are wealthier, and alumni contributions are important. So the utility function of the professor is actually linked to the grade of the student (also why you see more grade inflation at the more expensive schools, se, e.g., - http://en.wikipedia.org/wiki/Grade_inflation#Princeton_University http://en.wikipedia.org/wiki/Grade_inflation#Princeton_Unive...). In state schools, class sizes run much larger; granting an exception with a 200 person class is not likely to remain a secret for long. This means the penalty to professors for not following tit-for-tat is much greater. Also, professors at state schools just don't have the time available to even consider the excuses - it's easier to consider 4 unique cases (out of 20 students) at a private school vs. 40 unique cases (out of 200) at a public school.