The central thesis of this article is that the use of the profit-sacrifice test as the sole liability standard for exclusionary conduct, or as a required prong of a multi-pronged liability standard is fundamentally flawed. The profit-sacrifice test may be useful, for example, as one type of evidence of anticompetitive purpose. In unilateral refusal to deal cases, it can be useful in determining the non-exclusionary benchmark. However, the test is not generally a reliable indicator of the impact of allegedly exclusionary conduct on consumer welfare - the primary focus of the antitrust laws. The profit-sacrifice test also is prone to several significant pitfalls and often would be complex and subjective to implement in practice. As a result, relying on the profit-sacrifice test as the legal standard would lead to significant legal errors