I find it fascinating that thirty years ago, the sort of "default" unit of paper currency was a $20 bill — like, ATMs never output tens or fifties, it was always twenties, so you'd probably have a few andrew jacksons in your pocket — but today that's still the go-to.

Walk into any convenience store and try to pay with a fifty dollar bill, you're lucky if they even take bills that large, they won't want to make change, they'll pull out a highlighter to make sure it's real. But it's only worth about twenty bucks to anyone who was around for Nirvana.