The Justice Department sought on Wednesday to show how Google did all it could to get people to use its search engine and build itself into a $1 trillion search and advertising giant on the second day of a once-in-a-generation antitrust trial. From a report: First out of the gate, the government questioned a former Google executive, Chris Barton, about billion-dollar deals with mobile carriers and others that helped make Google the default search engine. Barton, who was at Google from 2004 to 2011, said the number of Google executives working to win default status with mobile carriers grew dramatically when he was with the company, recognizing the potential growth of handheld devices and early versions of smartphones.

Google's clout in search, the government argues, has helped Google build monopolies in some aspects of online search advertising. Since search is free, Google makes money through advertising. The government says the Alphabet unit paid $10 billion annually to wireless companies like AT&T, device makers like Apple and browser makers like Mozilla to fend off rivals and keep its search engine market share near 90%. In revenue-sharing deals with mobile carriers and Android smartphone makers, Google pressed for its search to be the default and exclusive. If Microsoft's search engine Bing was the default on an Android phone, Barton said, then users would have a "difficult time finding or changing to Google."

Barton said on his LinkedIn profile that he was responsible for leading Google's partnerships with mobile carriers like Verizon and AT&T, estimating that the deals "drive hundreds of millions in revenue." Hal Varian, Google's chief economist, told the court that scale, or the number of search queries Google received, was important, but pushed back during questioning on how important. He also acknowledged giving a speech in which he said certain search queries, for instance for a tennis racquet, were important in effectively advertising to the person who made the query and to subsequent ad revenues.