If there's one constant on Wall Street every investor should be aware of, it's change. History shows that, over time, Wall Street's biggest companies by market cap are constantly being reshuffled.

In 2000, brand-name businesses like , Intel, and General Electric were among the top 10 publicly traded companies by market cap. Today, just one of these top-10 companies from 2000 is still among the largest in the world (I'll get to this company a bit later).

No one has a crystal ball that can, with 100% accuracy, predict the future on Wall Street. But that doesn't stop investors from making educated guesses about the future, which is what I'm about to do now.

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Source Fool.com