Correct, it's the rarety of all others bank notes that is increased, increasing purchasing power is only one consequence possible but not the only one.
By the way, being hard to measure doesn't mean it doesn't exist. And there are plenty of things easy to measure that are meaningless
Bank notes are not re-issued 1:1 with destroyed notes.
>> being hard to measure doesn't mean it doesn't exist
No in this context it does. Either you can measure the increase purchasing power or you can’t. And if you can’t measure it, it doesn’t exist in this specific case.
By the way, being hard to measure doesn't mean it doesn't exist. And there are plenty of things easy to measure that are meaningless