People want to think of economics as a natural science, like physics, with the comforting reliability of simple-to-understand theories like F=MA. Unfortunately, it isn't. Economics is a social science, and the so-called theories are really social and moral constructs.

The person earning the federal minimum wage of $7.25 isn't going out to eat at restaurants. They're not taking piano lessons. They're not going to the gym or the yoga studio. They're not sending mom flowers on Mother's day. What good is this person in the economy? If you raise it to $15 an hour, they're doing all of those things.