The five have grown invincible to just about any competition. Their powers are a source of pride and fear for Americans. These companies dominate the news and entertainment industries, they rule ad and retail sales, and they’re pushing into health care, energy and autos. In the rest of the world, they are often seen as a reason for fear, not comfort. In part that’s because of a worry about U.S. hegemony: The bigger these companies get, the more room for possible spying by the U.S. government.
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