Quotes from the comments:
"Harry Lewis can also be part of the problem. He is, along with Bob Scalise and Tom Stemberg, one of the three biggest cheerleaders on campus in favor of lowering academic standards to produce a championship basketball team."
"Not only are "less than As" at Harvard occasionally seen as a sign that the student isn't smart or isn't working hard, but actual As aren't recognized or appreciated that much because they've been set as the status quo. This means that no matter what the grade, students here can feel the need to keep pushing themselves and striving for that elusive recognition and appreciation."
"Here's my thought on why cheating is so widespread here: I think that the motivation is simple, and is rooted in the fact that before coming here, we were among the very best at our high school. Then, when we got here, most of us still wanted to be among the best, to still get all A's while being a leader in extracurriculars, and so on. However, courses here are probably much harder than what we dealt with in high school."
It was also strange seeing Mankiw under the bus. Like or dislike his politics, he is a prolific blogger which generally suggests being in touch. http://gregmankiw.blogspot.com/
Again from the comments: "Harry Lewis is correct in stating that students cheat more in classes where they themselves feel "cheated" by the professor. It is baffling and inexcusable that Harvard continues to let Mankiw "teach" Ec 10 which affords him a credential he does not deserve. Talk about lying on your resume."