Trader Brian Jones on Twitter: "400 point drop on s&p in last 10 trading days. The system said to short on the 2 crosses which would have been right on 350 s&p points of the 400 so far. Short around 4300. Short again 4109. https://t.co/QuH6pGkfex" / Twitter

400 point drop on s&p in last 10 trading days. The system said to short on the 2 crosses which would have been right on 350 s&p points of the 400 so far. Short around 4300. Short again 4109.