> No discussion in the article about where this money came from.
The reason why there is no discussion of it is that it's a category error. Money is not used up when spent, but is immediately available to the seller who can use it again as he becomes the buyer of something else. Money is a stock. Statements about the increasing sales of ETFs are statements about flows. All of those could have "come from" a single dollar. And still the dollar would remain, standing proud, undefeated, not-used-up, and waiting to be spent on something else in yet another flow.
But wait, there's more. When the government "gives money" via covid payments, that, too, is a flow. The government merely sells a bond for cash to the bond markets, and then sends a check to a household, who deposit the cash in a bank, and the bank uses that cash to buy a bond from the bond markets, thus returning the cash to the same money markets from which the government borrowed it.
All of the 6 Trillion dollars in deficit spending could, in theory, require only a small amount of cash to support, because again the dollar is a stock and the deficit spending is a flow.
So the point of all of this is to understand that money markets can be used to generate trillions in ETF flows, or to support trillions of deficit spending, with no problem at all. Thus you should never ask where money to make an investment comes from, because it always comes from the money markets.
Instead, you should ask "are these assets fairly valued"? As long as the answer is "yes", then there will be money to buy them, completely independent of how much cash there is in the economy. Never believe anyone who says "there isn't enough money" to fund some investment. That's always cope for "I can't convince the capital markets that this investment will earn a good return".
And by the same token, never believe anyone who says "the government is injecting money into the economy in order to fund more investments", because it's impossible for the government to increase or decrease the amount of money held by the non-financial sector - at least the way our financial markets are currently structured.
All the government can do is deficit spend and adjust interest rates. Money is neither an enabler nor a constraint on any investment decision, but lowering interest rates could turn previously unprofitable investments into profitable ones, which means they will be funded once the capital markets are convinced of their profitability, and this is true whether or not any stimulus spending is provided by the government.
/rant