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the little-known but true fact is that the major predictor of your portfolio's volatility is not due, as most people think, to the individual stocks you pick, but instead your mix of stocks and bonds. In 1986, researchers Gary Brinson, Randolph Hood, and Gilbert Beebower published a study in the Financial Analysts Journal that rocked the financial world. They demonstrated that more than 90 percent of your portfolio's volatility is a result of your asset allocation.