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The NAM filed an amicus brief in the U.S. Supreme Court urging it to consider a class certification approved by the U.S. Court of Appeals for the Seventh Circuit. In the proceedings below, the district court applied, and the Seventh Circuit approved, a presumption of class-wide antitrust injury based on alleged price increases that occurred in an unrepresentative price index despite extensive evidence showing that the index price did not reflect the prices that individual class members actually paid. This case raises concerns that manufacturers in industries which feature price indexes will be exposed to expansive class action antitrust liability. The NAM’s brief explained that the Seventh Circuit departed from Supreme Court precedent when it approved a presumption of class-wide injury to avoid individualized inquiries that would otherwise preclude class certification. Unfortunately, the Supreme Court declined to hear the case.