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The Commensurability Myth In Antitrust, Rebecca Haw Allensworth

Vanderbilt Law School Faculty Publications

Modern antitrust law pursues a seemingly unitary goal: competition. In fact, competition—whether defined as a process or as a set of outcomes associated with competitive markets—is multifaceted. What are offered in antitrust cases as procompetitive and anticompetitive effects are typically qualitatively different, and trading them off is as much an exercise in judgment as mathematics. But despite the inevitability of value judgments in antitrust cases, courts have perpetuated a commensurability myth, claiming to evaluate “net” competitive effect as if the pros and cons of a restraint of trade are in the same unit of measure. The myth is attractive to …