I bought a bar of delicious white chocolate and kept it in the fridge. This was a couple of weeks back. I don't eat chocolate, I've got diabetes, but keep it in the house for visitors and people in the house.
But today, all of a sudden, when I opened the fridge, I started to look for the delicious bar, not to eat, but just to see it was still there. No, of course not, someone must have eaten it, or placed it somewhere else, so I won't eat it!
Some similar scenario must arise with bankers, as to where the money is. Sometimes it's in the vaults, sometimes in transit, sometimes sitting in the vaults of the regional banks. Ok, notes are not perishable and cannot be consumed like chocolate, but you get my point?
At that point, the central bank can print and issue more quids or greenbacks. It's just like filling the shelf, or putting some chocolate in the fridge. What's good is good. Must always replenish the fridge and the cupboards.
And, eat the fruit while it's good - that is perishable item.