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No I don't see why it's important to know how much "new money" is invested in the stock market. As I said before, the stock market goes up and down as people and firms put money in and take money out for a variety of reasons. How much is new money? Does it make any difference? No. Some of it is short term capital gains (taxed as ordinary income) and some long term capital gains. That's a factor at yearend as people cash out.
Some shift money in and out of bonds. Some buy and sell gold and precious metals or other commodities and shift in and out of the stock market. As the housing market changes people pull money out of the market to invest in real estate. That helps the economy. Some parents pull money out of the market to pay for their children's higher education. That's a form of investing.
Companies often buy their own stock when other opportunities to invest are less profitable.
Auto sales are doing well right now as some of the money is loans, but the down payment most likely includes money from the sales of stocks. That helps the economy.
Depending on global events foreigners buy and sell in the U.S. market depending on global events like Brexit until they understand the situation better. Americans buy stocks on foreign exchanges just as foreigners buy in the American exchanges.
And now baby boomers like me are cashing in so we can maintain our life styles in retirement. That actually helps the economy because we spend what we take out of the market.
So how much "new money" invested in the market versus all the other opportunities to invest doesn't mean diddly squat to me. You are pissing up the wrong tree in trying to read something into it that cannot be measured or quantified in the first place.