2008, 2010, 2011, and the recent events stemming from the Chinese markets seems like more than just twice in a decade. Also, correct me if I'm wrong but day tr

2008, 2010, 2011, and the recent events stemming from the Chinese markets seems like more than just twice in a decade. Also, correct me if I'm wrong but day traders / short sellers aren't obliged to keep the stock positions for any length of time. I just find the phenomena interesting in context of financial bubbles, as the largest financial traders are incentivized to exploit instability of markets, and would be eager to create bubbles for the inevitable pop and profits on the plunges.