CME Group faces former pit traders as its $2 billion trial gets underway. Crain’s finance reporter Mark Weinraub talks with host Amy Guth about the trial that will decide if traders will be compensated for the shift to screen-based trading.Plus: Baxter names a new CEO, Ald. Walter Burnett in the running to lead the Chicago Housing Authority, BlackRock to buy real estate firm with $7.3 billion in assets and Chicago area ranks among nation's most expensive rental markets.