Amazon can steer market-wide prices without ever colluding—exposing a gap in antitrust law that the FTC is now fighting to close.

The antitrust case is the most aggressive move the government has taken to tame the market power of Seattle-based Amazon. Amazon used a secret algorithm that essentially helped the company raise ...

Online sales in the U.S. surpassed $14 billion during Amazon Prime Day last week, according to Adobe Analytics. Amazon’s heft and promotional power continue to drive sales, even for rivals, during the ...