And while M0 is usually the most stable, not only DOES cash get created and destroyed, this is even independent of loan/debit creation (which is another measure

And while M0 is usually the most stable, not only DOES cash get created and destroyed, this is even independent of loan/debit creation (which is another measure entirely). Central banks may call in and destroy, convert, or give out cash to banks with and without changing loans/debits and so forth, for all sorts of considerations. It's really not that simple.