The stock market is pretty much just automated computers buying and selling to each other at light speed and making fractions of a penny on each deal. There's very little human interaction in the market anymore. Google HFT if you want to read more.
I think 90% is a big overstatement but a correction is due. The catch is on one hand the Fed is pumping $85B a month into the economy through the banks and the gov't and their printing press never runs out of ink. Zimbabwe had a stock market around 40,000 points by the time their money was worthless. On the other hand, we are getting up around the point where the 2008 crash started. Hard assets that retain value is a better investment than the stock market but also not as liquid.