Most of the World’s Companies Are Duds, Stock Picker Says
A chart of the S&P 500 Index, upper right, is displayed on a computer sceen on the floor of the New York Stock Exchange (Photographer: Daniel Acker/Bloomberg)

Most of the World’s Companies Are Duds, Stock Picker Says

(Bloomberg) -- Two years ago, an Arizona State University professor made waves with a study showing all the wealth created by U.S. stocks is the result of gains in a weirdly small group of companie...
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