This is a good read from Abnormal Returns: https://abnormalreturns.com/2017/01/05/soros-fallibility-reflexivity-and-the-importance-of-adapting/
“The financial markets are becoming ever more efficient at upending previous market relationships. Today, analysts rely on charts indicating the correlation between two or more financial variables to make some sort of market pronouncement. Unfortunately, correlations change. Josh Brown writes:
“Correlations don’t last forever, and there’s no one setting the timer. One of the biggest mistakes we can make as investors is to assume otherwise.””
I would add that zero correlations don’t last forever, either…
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