Except that I don't need permission from anyone to spend some cash in my pocket.
By paying in cash, you are complying with blanket permissions established in advance by government, the banking system and the shop owner. These permissions establish stability, value and standardization thus avoiding the need to barter and negotiate amount and form of payment prior to every purchase.
Establishing the US dollar "legal tender for all debits public and private" is what gives you permission to use cash conveniently and without hassle.
By paying in cash, you are complying with blanket permissions established in advance by government, the banking system and the shop owner. These permissions establish stability, value and standardization thus avoiding the need to barter and negotiate amount and form of payment prior to every purchase.
Establishing the US dollar "legal tender for all debits public and private" is what gives you permission to use cash conveniently and without hassle.