There are quite a few folks around here that do not understand supply & demand and how it affects the market price for goods and services.
Okay, maybe we don't ALL know it, but it is one of the basics of macroeconomics and common sense. ;)
I'm with on that. Economics was my minor in college, and now my kids are follwoing in my economics footsteps. They like the common sense of economics are are their grades are terrific.