The vast majority of trading is done by HFT computers now.
They buy and sell billions of shares a day based on algorithms. All you need to get a massive market swing is for 2-3 to hit their sell triggers at the same time, which snowballs into all the rest. Then the market swings back up as they hit their buy triggers enmass. The massive funds don't care since they trade large enough volumes to make money going up and going down. It is only the small scale investors who get screwed.
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In response to this post by OXVT)
Posted: 01/16/2018 at 3:21PM