My mental model of the stock market recently is a bunch of people driving too fast on the highway during a snowstorm. As conditions steadily worsen they all know they're not in control, but nobody else is slowing down so they don't either. It just takes some warning sign -- like a truck that's slid off the road -- then they'll all acknowledge the speed is unsafe and slam on the brakes together.
> Companies are already warning about significant impacts on quarterly earnings. Those are actual, real things — not people just realizing they got a little too excited.
But it's not clear (to me) the stock market prices are tied at all to actual, real things. Maybe relative prices of different companies reflect who's doing well compared to whom, but overall the market is up when people expect other people to continue buying and down when they worry they won't (both self-fulfilling prophecies). Maybe the only reason the market dips before recessions is investors expect a decrease in the total amount being pumped into the market by average people's 401k's.