More goodness from Dani Rodrik.
At the time, Harvey Mansfield and Michael Walzer alternated as the instructors of this course. Aside from obvious differences in political orientation, these two also differed greatly in their grading policy. One of the first things that Mansfield did on the first day of class was to write down on the board the grade averages in the course over the last few years. The see-saw pattern was obvious: you didn’t need to run a regression to know that the Mansfield dummy was negative and statistically significant. Mansfield looked at the class and smiled. We nervously smiled back.
Randy Newman has the executive summary.