Blame HFT for instant market drop
Is this a valid argument when most activity at the start and end of the trading day. As far as I know, it is the mutual fund/pension funds/etc posting their trades in automated way for reconciliation.
http://www.investmentnews.com/article/20150825/BLOG09/150829955/are-hft-and-computers-to-blame-for-the-markets-quick-dropFACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!