You sell that bill to someone who will put me in a coal mine or to clean out manure or something like that. Or, you want to buy services from a traveling salesman.
An hour of work is a notional Value - it is specifically only a Value - to be negotiated around. A traveling salesman should be clever enough to ask ahead of time which notes are best
"best", for his purposes, which are not everyone else's purposes. Fiat is easier that way, one note is as good as the next. We may need to sacrifice this, but there is a cost to that.
