Since the financial crisis banks have taken deposits and reinvested them at the Fed or other banks. Purchases of stock do not necessarily raise prices either. Prices can fall on heavy volume and rise in light volume.
That’s a paycut in purchasing power.
Only if prices rise. Consider that this island only sells widgets in this currency. Will they raise prices because the money supply has increased? They were “maximizing” profit before, but now the money supply is different and the employee on the island still makes 20 coins. Will selling widgets at a new price point get them more money?
A transaction for stock is the same as any other transaction. It terminates once money is exchanged. You do not extrapolate what happens after. When I pay my check at a restaurant does the cook run out the door to spend my money or does it go in the register?
I saw your other posts and wanted to point out a few key points.
Have you read Capital? It goes through money and velocity pretty thoroughly early on and I think addresses some pretty big assumptions econ classes tend to present.