Rice sets out guidelines to aid in preemption analysis. Preemption should not occur "simply because in a hypothetical situation a private party's compliance with the statute might cause him to violate the antitrust laws." This language suggests that preemption occurs only if economic analysis determines that the statutory requirements create "an unacceptable and unnecessary risk of anticompetitive effect," and does not occur simply because it is possible to use the statute in an anticompetitive manner. It should not mean that preemption is impossible whenever both procompetitive and anticompetitive results are conceivable. The per se rule "reflects the judgment that such cases are not sufficiently common or important to justify the time and expense necessary to identify them."