A former top antitrust economist in the Obama administration argued Monday that Alphabet Inc.’s Google has used its powerful position in the digital advertising space to stifle competition, outlining a possible case against the search giant at the same time federal and state enforcers are making preparations to go to court.

“There is significant reason for concern that Google has violated U.S. antitrust law,” Yale University economics professor Fiona Scott Morton, the chief economist in the Justice Department’s antitrust division…

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