Where futures traders suffered losses and liquidated their positions rather than risk further declines, introducing broker could not be held liable for the gains the traders missed, even though introducing broker took action that caused traders to need higher margin to maintain contracts.The 7th U.S. Circuit Court of Appeals affirmed a decision by Judge Jorge L. Alonso, Northern District of Illinois.Several affiliated traders set up four accounts with Trean Group, an introducing broker at the Chicago Mercantile Exchange …