In investing, nothing is written in stone. Yet, investors often operate as if the opposite is true…to their own detriment.
One mistake investors make is to focus too much on the averages of history while ignoring the deviation from the averages that always seem to happen in the short term. The clearest example of this is the stock market itself, via the S&P 500. It’s never, not once, earned its average annual return in a single year. Check for yourself.
Then there are the investing rules of thumb we all rely on because they work…most of the time. The mistake, of course, is to never question them.
Peter Bernstein reiterates this point in summing up market history. Investing is guided by the past but the future is not limited to what has already happened. A level of uncertainty, however small, always exists that can surprise us: Continue Reading…

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