Many ways exist to chart shakiness in the stock market. There’s options-derived volatility indexes, price relative to moving averages and maximum drawdowns, to name a few.
Then there’s the type of whole-cloth vanishing act the Nasdaq 100 has been staging in recent weeks, sessions in which the index appears headed for resounding gains or declines -- before the whole thing goes poof in a matter of minutes. It happened again Thursday, when the tech-heavy gauge erased a 2% rally and kept falling in its worst bearish reversal in 17 months.
