Inside Higher Ed reveals that professors who are "easy" get higher student reviews.
This inspires Glenn Reynolds to comment, "Education, as they say, is the only consumer product where the consumer is out to get as little as possible for the money."
After thinking about this I realized it's perfectly rational for students to think this way. After all, students are paying for the credential and not the opportunity to learn. With the exception, perhaps, of laboratory or fieldwork classes, anything you learn in college can be learned for a lot less money by buying the textbook at Amazon.com--or even for free by going to a library.
However, the pecuniary return to the student depends upon his grades. A student with a 4.0 GPA who learns a little will get into a better graduate school and have better job opportunities than a student with a 3.0 GPA who learns a lot. So the student with easy professors truly does get more benefit from his college "education."