STEEP GRADING CURVE. On Thursday, I was a guest of the Securities Industry Foundation for Economic Education, operators of the Stock Market Game, at their annual conference for state coordinators. At one of the sessions, a presenter noted that more college students drop out account credit card troubles (here's a test for libertarians: what restrictions ought a university place on sales efforts, including t-shirts and other inducements, that credit-card and cell-phone companies put in front of students?) than account bad grades (or boyfriend or girlfriend problems, or are many of those fallout from credit cards.)