A man leaves an Apple store in Beijing in 2019. (AP Photo/Andy Wong) OAKLAND, Calif. (CN) — A federal judge continued to press a prominent economist on his theory that Apple forecloses competition in the iOS app distribution market as he took the stand for a second day of questioning in Fortnite game maker Epic’s antitrust battle with the tech titan. David Evans, chairman of Global Economics Group and Epic’s main economic expert, struggled at times to relay his granular points, even to U.S. District Judge Yvonne Gonzalez Rogers. Evans testified that the App Store provides two products: app distribution services and an iOS in-app payment solutions. And he said that Apple is a monopolist that “has been able to increase the price for payment solutions by a significant amount.”