David Kamerschen is a professor of Economics at the University of Georgia who has fun teaching economics to new students fresh to the field. Lots of people who teach economics, including yours truly, have used a variation of David's illustration over the years. It never fails to hit the mark -- if not Marx. Econ 101 or its equivalent is usually a required course for most college students, most of whom groan when they are forced to take a class in the "dismal science". That's because they never were exposed to real-world lessons in economics when they were in grade...