> stores would pull out the credit card imprint machines, but those don't work anymore because cards are flat
It's the other way around: Cards are flat because a carbon imprint doesn't afford the merchant any payment guarantee by the card issuer anymore anyway. (In other words, the "floor limit" above which cards require electronic authorization is now zero.)
It's the other way around: Cards are flat because a carbon imprint doesn't afford the merchant any payment guarantee by the card issuer anymore anyway. (In other words, the "floor limit" above which cards require electronic authorization is now zero.)