Absolutely nothing here - not one thing - has changed the money supply - it remains at $100.
It is true that there are a lot of demands upon that $100 ... Guy A and Guy C as depositors, and Guy B who used it to buy a car.... but the money supply has not changed
A demand on the deposit does not create money. It creates risk of a whole mess of other nasty things, like a default - but money supply? Nope.
Alright, I see now part of the genesis of the mental sleight of hand that you're pulling on yourself.
You make your own personal distinction between "money" and fiduciary media created by the banks - which you don't technically consider 'money', and therefore not part of the 'money supply'. And since we're being semantics sticklers, we're even using the term money
very loosely, when referring to it as the reserves created by the Fed - even that's a misnomer, because it is the Treasury that actually creates money, while the Fed creates
accounting entries. Which, by the way, the Central Bank of Libya saw as money when it took out some $5 billion in loans from the Fed. Nothing but accounting entries -- out of thin air. Without the Treasury, the only money printer, knowing about it (or so we've been told). BUT...no law against it, right?
Anyway, if you also notice in my chart, the green cumulative deposit entries for each bank total around $100, while the red bottom-line entry shows a boatload of claims on that same $100 in aggregate reserves - not just a case of Guy A and Guy C; that original deposit whore was had by everyone on the football team. And, for the sake of simplicity, we could call those two banks the entire closed loop banking system under the Fed. More than two are not required for the sake of illustration.
So you are technically, semantically and irrelevantly correct - given your definition (taken in the context of your words) of "money". Fiduciary media is created by completely different mechanisms than reserve currency created (or destroyed) by the Fed. What they do have in common:
a) They are both fictions. Voodoo Monopoly money in a cancerous system that could never have started without a an otherwise healthy host to begin with, and
b) they are coupled, in that the supply of fiduciary media affects the market value of the Fed media that backs it, and vice versa. And finally,
c) all of them represent debts - which, if I'm going to be stickler myself, I don't consider money anyway.
That is why it does not matter whether it is a digital entry from the Fed, paper currency fresh from the Treasury presses, or demand deposits from the bank. If they circulate or otherwise behave as currency, and their values are coupled one with another, the market itself - that all-important 'economy', 'sees/feels' it all as "money supply". I conflate the two readily, because in this fine little closed loop banking system of
not ours, that is precisely what the market does.