The present Federal Rules of Civil Procedure allow a plaintiff’s case to be attacked either for its legal or factual sufficiency. The rules governing the former are in general adequate because judgments on the validity of claims do not require any discovery. Decisions before trial on factual matters are much more complex, especially in antitrust cases where discovery before a summary judgment motion can be highly expensive on open-ended claims of collusion over prices or territories. To counteract that risk, all courts today allow some judgments to be entered at the close of pleading and before discovery. The recent Supreme Court decision in Bell Atlantic Corp. v. Twombly, reversing the Second Circuit decision in Twombly v. Bell Atlantic Co...