Here is Google’s attempt to measure its the economic impact of Google search and adwords, adsense and its Google grants programs. Some media coverage (including a critique of the calculations) here. The total? $54 billion. The report includes state-by-state breakdowns. Not exactly a made-for-litigation antitrust expert report, but I’m sure a few copies have been printed over at the Agencies this week.
Google's Very Public Efficiencies Defense
Joshua D. Wright, Google's Very Public Efficiencies Defense, Truth on the Market (May 26, 2010), https://truthonthemarket.com/2010/05/26/googles-very-public-efficiencies-defense/
