With an estimated net worth of $155 billion, Warren Buffett is the eighth richest person in the world, according to The Bloomberg Billionaires Index. What's stunning about Buffett's wealth is he acquired it primarily through stock market investments.

There is a very good reason why Warren Buffett is known as the Oracle of Omaha. Since taking control of Berkshire Hathaway (NYSE:BRK-A)(NYSE:BRK-B) in 1965, Buffett has generated cumulative returns 5,

Such a precipitous increase in the value of U.S. equities has stirred up the usual cacophony of equity-bears screaming “bubble!” “Bubble” is a popular term, but, as it turns out, is rather ill-defined and fuzzy.