Margin calls all over Wall Street. This happened faster than 2007. Many more investors & traders got caught with their pants down this time. The only way you could of sold near the top last month was to have a T.A methodology like most of us on here, follow analog charts comparing todays market to that of markets from 1929, 1987, 2000, 2008. & more specifically if you use Elliott Wave analysis for price action and social psychology.