I am such a shopping ignoramus. I don't even know why today is being called Black Friday. It has something to do with today being the biggest single day for U.S. retailers. But why does that make it black?
UPDATE: Marsha just explained it to me. It's the date when many retail stores first "go into the black", in the accounting sense of having annual income exceed expenses.
When you're in the red, you lack
What you have when you're in the black.