It's called fractional reserve lending. As "money" gets spent into circulation via loans having been made, those loans at some point come due. As people with loans start paying back the "money" they'd borrowed in the past, it removes "money" from the pool of "money" we all use. It gets replenished by new loans being made and that new credit "money" being spent into circulation. ...and then the cycle repeats constantly until the point of debt saturation is reached. Are you saying you don't understand how our "money" that we all use is created?....and later extinguished?