The very wealthy typically invest ... everything? So this means more investments in new businesses and projects and research, and ofc those new businesses and projects and research needs workers who get paid.
“Investing” is a huge range of activities. So huge, the word means very little. Again, doesn’t man much of anything trickles down. Wages haven’t risen while billionaire have hordes money
Invest yes but one could argue that money circulation is more important. Give it to the poorer members of society and they spend it in small shops who then spend it in other small shops and you get an exponentially increasing spiral of demand
Do you “know” this by just deductive reasoning, or do you have statistics, data analysis, and/or studies to back this up? Common knowledge can just as easily be a common falsehood