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The Knight trading misbehavior bid the market up, not down. It didn't make its intraday lows until about 12:30 and the S&P500 never fell by more than 1%. Maybe if the puts were on …

I don't know precisely what the article means. The NYSE Retail Liquidity Program, which still exists, describes two categories of participants: member organizations (MOs) and liqui…

Cool story, didn't happen. There were no retail trading accounts at Knight. In fact, there was no outside money of any kind. The S&P500 fell about 0.75% on the day in question: a n…