#16 Under the merchant agreements of MC, Visa, and Discover Card, vendors may not require a minimum purchase amount.
Folks found my previous post about how to sign over a check to someone else interesting. Continuing the theme of financial literacy, but adding in a dose of history, I thought I'd pass this link along. The author found fifty odd, interesting, and relatively unknown facts about credit cards.
It's a worthy, quick read if you want to learn a little more about those magic pieces of plastic in your wallet.