This [covariance] is something that is not in the habit of t — Robert J. Shiller | Quote

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"This [covariance] is something that is not in the habit of thinking of most amateur investors. They look at their investments one at a time, and they dont, you always have to go back and say, whats the covariance? Thats what really matters for what happen to your portfolio. Because when you invest in a lot of companies that are all the same, youre asking for trouble, because the whole thing is going to either blow up or succeed. And you cant live like that. You have to be looking for low covariance."

Robert J. Shiller

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Robert James Shiller is an American economist, academic, and author. As of 2022, he served as a Sterling Professor of Economics at Yale University and is a fellow at the Yale School of Management's International Center for Finance. Shiller has been a research associate of the National Bureau of Economic Research (NBER) since 1980, was vice president of the American Economic Association in 2005, it

This [covariance] is something that is not in the habit of thinking of — Robert J. Shiller