Why Do the Biggest Companies Keep Getting Bigger? (WSJ)

Your suspicions are correct: The biggest companies in every field are pulling away from their peers faster than ever, sucking up the lion’s share of revenue, profits and productivity gains. New data suggests that the secret of the success of the Amazons, Googles and Facebook s of the world—not to mention the Walmart s, CVSes and UPSes before them—is how much they invest in their own technology.

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