The Pink Floyd Paradox

Someone I know teaches at a high school that recently had a "dress up as a band day", which really means to dress up with whatever band merchandise you own.

Something we thought about, that I'm positing as the "Pink Floyd" paradox, is whether or not an influx of students will wear Pink Floyd-related merchandise because so many people own Pink Floyd merchandise, or will nobody wear anything from the band because they won't know that Pink Floyd is actually a band and not a brand.

Sadly, that teacher was sick the day of the event and couldn't gather intel. What could've happened?