FINDING THOSE MISSING MEN. My Principles of Microeconomics class meets at 10 am. The mix of pre-business and other majors, ethnicities, and men and women is about what one might expect from randomly sampling the population of Northern's students confronting an economics requirement. The 11 am section, which uses the same room, looks to have a critical mass of female students many of whom are eager to be in their seats as soon as I dismiss the 10 am section ... and only a few male students filter in by the time the class starts. Harbinger or outlier?