Washington-and specifically its antitrust power-was back on investors' radar with a vengeance this week, erasing in a single trading day almost $140 billion in the market value of the big four tech companies: Amazon, Apple, Facebook, and Google parent Alphabet. Combined with the uncertainty caused by spreading trade tensions-Mexico and India were added to a list of targets that remains dominated by China-and the need to watch for presidential tweets at all hours, the reports of potential antitrust investigations into the four companies served to remind investors just how much the game has changed under the current administration.
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