> it can be readily and universally exchanged for goods or services I'm pretty sure all of the retailers in my area only accept USD. Nobody even bothers with

> it can be readily and universally exchanged for goods or services I'm pretty sure all of the retailers in my area only accept USD. Nobody even bothers with the Canadian exchange rate on this side of the border, although some (and any vending machine) will refuse Canadian coins instead of accepting them at a 1:1 value with American ones.