The fate of Google’s search business is now in the hands of Judge Amit Mehta, as closing arguments concluded in the landmark trial on Friday.

The Department of Justice and plaintiff states made their last arguments Thursday on Google’s alleged anticompetitive conduct in the general search market, and on Friday focused on its allegedly illegal conduct in search advertising. Google was also under fire (separately) for failing to retain chat messages that the DOJ believes could have been relevant to the case.

The government is trying to show that Google locked up key distribution channels for the general search engine market, so that would-be rivals could not grow into significant threats. It says it did so through contracts with phone...

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