The stock market is delaminated from the real market, and has been for a while.

How this has happened is not simple but a short version is that as the stock market has evolved it became a key place to put assets with a level of growth expectation. As time goes on the demand for a place for investment without effort (starting your own business vs investing in a businesses stock) keeps getting larger and the alternatives keep getting less desirable (bonds, GICs, etc.) causing a sort of investment feedback loop. There is X amount of money that needs to be invested each year lets say, and if every thing is crashing (waves at the general state of things) it means nothing is since pensions, people and firms still need to have that investment somewhere.

As long as there is still some expectation of return and faith in the current stock market you will have investment and as stocks (and therefor the market) are measured by the demand (the buy vs the sell) we have the current situation. If you want to see what happens when a stock market looses people faith and therefor investment look at China’s stock market crash https://en.wikipedia.org/wiki/2015%E2%80%932016_Chinese_stock_market_turbulence