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Them so drastically yesterday, and why we see such volatility in the market today. again, a lot of people would rather have seen this happen over the course of ten days, a couple of weeks, then such dramatic gyrations. >> and again, could you remind us as to why market experts believe there was such a significant drop? >> at 3:00 p.m. yesterday? >> yes. >> reporter: there are lots of theories out there. one theory is the algorithmic trading. another is the derivative that makes up a small part o...