The government's expert witness in its antitrust case against Visa and MasterCard was grilled on Thursday by MasterCard's attorney, who - like Visa's attorney on Wednesday - asserted that he presented a biased view in his 226-page expert's report.

The MasterCard lawyer, James Egan, asked why Michael L. Katz, an economics professor at the University of California at Berkeley, failed to include references in his report to documents illustrating robust competition between Visa and MasterCard.

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