Mark Israel, who prepared an expert report on Google's behalf, said the government's claims are hyper-focused on a narrow market.

Federal regulators who say Google holds an illegal monopoly over the technology that matches online advertisers to publishers are vastly underestimating the competition the tech

Economist Mark Israel reported that when all online display advertising is accounted for, Google gets just 10% of the U.S. market share.

A witness called by Google said other large media companies like Meta provided competition that showed Google didn't monopolize the advertising market.

Google opened its defense against allegations that it holds an illegal monopoly on online advertising technology Friday with witness testimony saying the industry is vastly more complex and competitive than portrayed by the federal government.

Google is defending against government allegations of holding an illegal monopoly over ad tech. Expert witness Mark Israel argues the government's case narrowly defines the market, failing to consider broader competition from social media and online retailers.

The tech giant, which wrapped up its arguments in the federal monopoly trial, simply says it has the best product.

So a search engine walks into court… and just like that, Google might not be able to search for a solution to its current woes. Google is in an antitrust trial, and it is looking like U. S. v. Google is going to be quite the digital debacle.

The antitrust case against Google found that it conducted its business as a monopoly. Read more on what the decision could mean for GOOG investors.

The U.S. Department of Justice is currently in an antitrust trial against Google. The DOJ says that Google has a monopoly in the ad server market. This means that Google has too much control over the buying and selling of online ads.