Or highly leveraged short-selling. Institutional insiders with an information and speed advantage drive bids to test the strength of selling. Highly leveraged p

Or highly leveraged short-selling. Institutional insiders with an information and speed advantage drive bids to test the strength of selling. Highly leveraged positions can only tolerate small losses before they have to stop out. If that is a widespread market position you get these weird market movements in the opposite direction to what makes sense, because closing out of a big short position while the price is going up, just drives the market higher and higher.