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Is Illiquidity a Confounding Variable?
I mean I guess you know that certain things will can get more illiquid so let's say small caps can get more liquid and in doing so can have more extreme moves. But we all know already that small caps are correlated to larger caps so that's not a good example of what you're asking. Another classic example would be like private equity or real estate things that have illiquidity premiums. They tend to maybe be slightly statistically uncorrelated but then when liquidity dries up, correlations go to one as we saw in 2008.