I was listening to a guest a few weeks ago on Coast to Coast, explaining how technology is exceeding our ability to understand it, to the point of ridiculousness.
And he talked a bit about the stock market. How it isn't even humans anymore making the descisions, it's all computer programs using algorithms. And how these financial companies are hiring Astrophysicists to design these programs that play the stock market to maximize profits to the umpteenth penny. And this stuff is so fast, that with AI artificial intelligence, someone can make a tweet for example about a company, the the algorithms will detect it, and sell the stock before it can even drop.
These programs short stocks all day long, automatically, without a human deciding.