The market is in turmoil and BNP is complaining about liquidity issues. I went back to look at an interview from Scholes (author of Black-Scholes pricing) for an opinion on the situation.
As a result, “decision time becomes elongated” and speculators hold back their capital just when their services are most in demand. The lack of liquidity itself then becomes a factor in asset pricing, leading to swift, sharp drops in values.