IMO it doesn't exists, because Bitcoin is very volatile.
One day it's 1 BTC=$260, the other is 1 BTC=$60.
Now, if you hate fiat, you can count in loafs of bread. The ultimate test of value.
One day it's 1 BTC=130 bread, the other is 1 BTC=30 bread.
Problematic, huh ?
IMO: only time where it matters to pay in Bitcoin denomination is if you buy Bitcoin-equivalent: i.e. Bitcoin miner or
physical Bitcoin.
-Technologov