Sure, but nominal value is not what you use to buy things. The nominal value in my bank account won't just go down on its own either. But what I can do with it will.
Or is there a mechanism I don't know about that can lower nominal numbers in untouched bank accounts?
> The nominal value in my bank account won't just go down on its own either.
It would with negative interest rates.
presumably to reduce the inflation of prices. 6 of one, right?
The number on the paper != purchasing power
Sure it can, banks would just have to modify the exchange rate between physical cash and bank deposits.