It’s difficult. Despite a valiant effort, the defendants in In re: High-Tech Employee Antitrust Litigation, 2014 U.S. Dist. Lexis 47181 (N.D. Cal. Apr. 4, 2014) (Koh, J.), failed to exclude the expert testimony of plaintiffs’ economist, who has opined on the purported wage impact of the defendants’ alleged bilateral agreements not to cold call each other’s employees.
I won’t cover the complex statistics and econometrics here, but if you’re interested, I’m attaching a copy of the decision (click the link).