Trader Brian Jones on Twitter: "How would I know without the system that I shouldn't buy the drop? Because I already know if the S&P broke below the 50 sma that would be a sell signal to short. I had a big advantage. https://t.co/3P5iENcNgD" / Twitter

How would I know without the system that I shouldn't buy the drop? Because I already know if the S&P broke below the 50 sma that would be a sell signal to short. I had a big advantage.