The gist was that if everybody is paying with credit cards, $50 will eventually whittle down to $0 because AmEx, et. Al. got $50 worth of fees after so many transactions (accountant pays grocer who pays dentist who pays hygienist who pays daycare, etc.). On one hand, what a huge waste of money. On the other hand, I as the consumer typically don’t get a discount for paying with cash, so why shouldn’t I take advantage of the “free” and secure payment option available to me?