By David McLaughlin
U.S. antitrust enforcers are set to conclude their case against AT&T Inc.'s proposed takeover of Time Warner Inc. as their economic expert -- a critical witness for the government -- is scheduled to take the stand Wednesday.
Professor Carl Shapiro from the University of California at Berkeley will testify that AT&T's acquisition of Time Warner would raise costs for pay-TV consumers across the country by hundreds of millions of dollars a year.
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