Google says DOJ's 'narrow view' of the adtech market is not based on reality ahead of antitrust trial

• The Department of Justice's latest antitrust case against Google opened Monday.
• The DOJ accuses the tech giant of building an illegal monopoly of the digital-advertising market.
• In a blog post before the trial, Google said the DOJ's "narrow view" of the market wasn't realistic.

Google and antitrust regulators are facing off in federal court over allegations that the tech giant built up an illegal monopoly of the $300 billion US digital-advertising market.