If you want a little more reading on the subject, there's a neat writeup here:
https://www.philosophicaleconomics.com/2013/08/the-great-rot...
"(1) For every share of every asset in existence, someone must willingly hold that share at all times. If no one can be found who wants to hold a share, its market price will fall until someone is found.
(2) The total “amount” or “supply” of a financial asset is the total market value of it in existence: the number of shares outstanding times the market price. Asset “amount” or “supply” is therefore flexible for all assets except cash, whose market price is always unity. If there is more financial wealth that wants to be allocated into an asset than exists of that asset, the market price of each share of the asset will rise, which will expand the supply of the asset so that the demand can be satisfied."
"Money is not something that can go into or come out of assets; rather, it itself is an asset that is traded for other assets. The offered rate of exchange is the price. Changes in the price can create the perception that money is moving, but, in reality, nothing needs to be moving at all. Any movement that does occur is incidental to the underlying process.
Likewise, investors cannot leave or enter any asset class. All they can do is fight with each other over who will hold each asset class, offering to exchange money at various rates in exchange for the privilege of holding something else. The consequence of shifting preferences and exchange rates may be a destruction or creation of wealth in various places, but it is never a “movement” of wealth."
