My wallet bulges, but it isn't because of money. No, it is a hefty critter because it's stuffed with train passes, metro passes, telephone cards, bank cards, credit cards, ID cards, point cards for individual stores, video store cards, meishi from people and restaurants, and random scraps of paper littered with notes.
That's absurd. There is no reason why anyone should have to carry around all those payment devices, nor why a single ID card doesn't do the trick. It's always me and it's the same (shrinking) pile of money.
One card ought to be able to prove that I am me, and therefore that the cash being proffered is my money. In short, the card should get smarter.