A tuyere is a weird, tough, heat proof, somewhat hard to make (depending on your local technological level) compressed air nozzle. If there's a steel mill blast furnace nearby, you can make a fat stack of cash making and selling tuyeres. Its kind of a specialists metalworking job in that an idiot can make one that doesn't last and falls apart at the worst possible time causing thousands of dollars of missed production, but a specialist can make a good one. If you operate a steel mill blast furnace you won't make much money without a supplier of cheap, quickly replaced, reliable tuyeres (and you also require a zillion other things...) If there's no steel mill nearby then a tuyere maker won't be in business very long.
Anyway the point is much like some agriculture analogies you plop down a steel mill next to a metal shop specializing in tuyere construction and repair, and they both thrive. Take away either, and the other eventually disappears. Going back in history there is no spontaneous generation of either blast furnaces or tuyere metalworking shops separately. They always and only develop, grow, and survive together, simultaneously.
Now lets talk about another pair of technologies that can only thrive in the presence of each other... the capitalist stock market, and early industrialization. Unlike the tuyere example, for both of these, without the other, they can exist, barely, but only a thousandth the size in the long run if required to operate alone. You can kinda industrialize without a stock market, communist style, but it doesn't work nearly as well.
The USA is in a post industrial era. Therefore soon we'll be in a post stock market era. Stock trading will still exist, just maybe a thousandth the size, volume, and importance.
Even today the decline is evident. I'd estimate a century ago "everyone" in my family and maybe in the country worked for a stock market financed industrial company, or indirectly in that all their revenue came from stock market financed industrial companies. The value of the DJIA directly influenced if the railroad expanded and therefore promoted my g-grandfather. Today? Half the population does not work (young, old, sick, unemployable, etc), my wife works for the .gov so the market means nothing to her, my sister and I work at (different) megacorporations that are so large the market cannot handle them anymore (like our employers influence the market, not the market influences our employers LOL). Many of my friends work for non-profits or privately owned/financed firms. My dad's last day at his career position in a stock market financed company was in the early 80s, and it was mostly contracting at privately owned companies for the next 20 years. I've only worked at two companies financed by the stock market and I've never had a career and probably never will. I could do pretty well without the market.