With stocks resuming their plunge, an old market bogeyman has emerged – the same one which Bill Blain said earlier scares him the most, namely the lack of liquidity. And unfortunately, in a perverse feedback loop, the more equities drop, the worse the overall S&P liquidity, as the following chart from Barclays show, depicting the collapsing bid/ask size in the Emini, which is now do to the lowest on record.
https://www.zerohedge.com/news/2018-12-20/sp-liquidity-just-dropped-lowest-record