Dow off 20 points yesterday. Gold down $6 an ounce. No biggie. On Monday and Tuesday, we visited our youngest son, Edward, a sophomore at the University of Vermont. His roommate joined us for dinner. “Okay, let me explain it to you,” we said. The roommate was wondering if he should switch his major to economics. “Economics is a phony science. The more you study it, the more you think you know… and the less you really know about how an economy actually functions. “I’ll explain why in just a few sentences.