Everybody knows that Chicago scholars dismissed predatory pricing as a practice of concern for antitrust law due to its alleged unprofitability, both relative and absolute. Many know that the dismissal dates back to the early years of the Chicago revolution in antitrust and has been reiterated ever since. What is less known is why those scholars focused so much on that specific unilateral practice. The paper shows that, from Aaron Director in the mid-1950s to, among others, John McGee (1958) and Robert Bork (1978), demolishing the traditional story about predatory behavior has always been a strictly necessary component of the Chicago School’s broader assault against established Section 2 case law.