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Analysis of the "Flash Crash"
Date of Event: 20100506
Part 5, Crash Myths

There are many who believe that the NYSE "Slow Quote" mode or LRP's (Liquidity Replenishment Point) caused the market to drop. However, only 1 stock was in slow quote mode when the final decline began, and only 3 were by the time it was half way done. From the chart below it is clear that the NYSE was not entering slow mode until WELL into the collapse:

Chart 1:

Furthermore, the stocks entering "slow mode" were trailing the market, not leading the market. The stocks that led the market are the same stocks we analyzed in Part 3, The Evidence. PG was such a stock that trailed the market. From the following chart you can see that PG had NO trades on the NYSE when it entered "slow mode" from approx. 14.45.30 to 14.47.15 and that at this time, the market had already collapsed.

Chart 2:

It is also clear that Apple trailed the market and was not the cause of the crash:

Chart 3:

Stub quotes did not cause the crash. You can see from the charts below that while stub quote counts did rise, they did not become prevalent or effect BBO prices until the crash was almost over. One could infer that the presence of stub quotes is a good indication of a lack of liquidity.

Chart 4:

Chart 5:


Publication Date: June 18, 2010

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