1. What it means to actually "work" for your money
Perhaps the most valuable thing you learn from a retail job is what "work" actually is. Getting paid a little more than minimum wage to deal with people, fold clothes, and go through the living hell known as "inventory" once a year actually does a lot to teach you the value of a dollar. You start thinking things like "if I buy these shoes... that's roughly 12 hours of work." And maybe, just maybe, you become a little wiser with your money because of it.