Holding that class certification is inappropriate where complex, individualized damages calculations predominate over the liability issues that are common to the class
Holding district court erred in granting summary judgment for plaintiff as to scope of relevant product market because plaintiff had not alleged sufficient facts to satisfy its burden of showing products were interchangeable
Holding that construction contractors were collaterally estopped from challenging liability in state's antitrust action based on prior criminal convictions under RICO
Affirming district court's rejection of damages expert's testimony because of "considerable and unjustified variance" between testimony and Rule 26 report and because expert "unintentionally misled [court to believe] that he had performed certain crucial calculations" he had not actually done