A U.S. Economic Slowdown Has Been Confirmed, And We Are Being Warned ...... (Snyder), page-23

Hi P
Money is classed by the masses as anything they can exchange on the spot for something they need or want
Currently in the western world we have the fiat system of bits of paper ( or plastic) and we have credit cards which can be transacted on the spot for goods

All the other "things" are valuable but not actually money, like bitcoins, gold etc