Although history doesn't repeat to a "t" on Wall Street, it does have a tendency to rhyme.

History can be an amazing teacher on Wall Street for those willing to listen. Although what happened in the past doesn't often repeat to a "t" in the future, things do have a way of rhyming for the stock market.

While nothing comes with a guarantee when investing, data from Crestmont Research shows that every rolling 20-year period for the benchmark S&P 500 when back-tested to 1900 has generated a positive total return, including dividends. This is another way of saying that if an investor had, hypothetically, purchased an S&P 500-tracking index at any point between 1900 and 2005 and simply held for 20 years, they'd have made money every single time!

History can also be a helpful guide when it

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