On Wall Street’s most turbulent since the COVID-19 outbreak, a Harvard economist explains what’s going on.

The S&P 500 plunged as much as 7.4% in the first few minutes of trading, and losses were so sharp that trading was temporarily halted.

People don’t buy and sell anymore. Computers do.

They can indicate where the market is going to open, but they’re not a crystal ball.

A trade war, the overvaluation of stocks and the 2020 election have also contributed to uncertainty.

Is that concern misplaced? A New York Times economics writer talks about it.

Was it a predictable event? Then Wall Street’s reaction might already be “priced in.”

“It’s not as simple as it might seem,” said Andrea Eisfeldt of UCLA.

In the world of high-speed trading, a lot can happen in .000002 seconds.

But, yes, the two are related. And that relationship can get pretty interesting.