I'm going to attempt to do this on a semi-regular basis.
Ever hear of Peter Drucker? Sigh. A management consultant and thinker, he thought economists were full of hooey. When you go to business school, you learn about Drucker and Management by Objectives. At his best, he just tells us to keep it simple and smart.
Update: I always screw this up, even though it's so simple: "Efficiency is doing things right, Effectiveness is doing the right things."