Historically, we have always seen reversion to the mean. After stocks have had an unusually great 10 or 20 years, they typically turn in subpar results over the next 10 or 20, and after bad 10- to 20-year stretches, the next 10 to 20 tend to be above average.

Stocks change. Industries change. But the underlying reasons certain stocks are good investments remain the same. Only the fullness of time reveals which are the most sound.

You'll get nowhere buying stocks just because they have a great story.

James O'Shaughnessy Quotes