Antitrust Cartel & Collusion Evaluator

Evaluate horizontal market allegations, mutual pace/output restrictions, and Sherman Act Section 1 "Plus Factors." Calculate Stigler cartel stability thresholds (δ*), market concentration (HHI), and Twombly motion-to-dismiss survival viability.

Case Presets:

Allegation Parameters

Matter / Industry Title

Alleged Unlawful Agreement

Market Concentration (HHI) 2,650 (High)

DOB/FTC thresholds: <1,500 Unconcentrated, 1,500-2,500 Moderate, >2,500 Highly Concentrated.

Defendant Market Shares (%)

Combined Alleged Cartel Share: 90%

Firms' Time Horizon / Discount Factor (δ) 0.82

Patient firms (δ close to 1) sustain agreements easier than short-horizon firms.

Sherman Act § 1 "Plus Factors" Present

Actions Against Independent Self-Interest Conduct makes zero economic sense absent reciprocal commitment by rivals

Direct Interfirm Communications Backchannel meetings, executive texts, private trade group accords

Abrupt Shift from Vigorous Rivalry Simultaneous sudden change in release cadence, pricing, or safety pacing

Pretextual Public Justifications Public rationale contradicted by internal commercial emails/slack memos

Facilitating Practice / Info Exchange Private sharing of non-public release timelines, audit tests, compute specs

Enforcement / Retaliation Threat Mechanism exists to rapidly detect and punish cheating or unilateral speedup

Critical δ* Threshold

0.75

Stable (δ 0.82 ≥ δ* 0.75)

Market Power (CR4)

90%

4 Def. Combined Share

HHI Concentration

2,650

Highly Concentrated

12(b)(6) Viability

Strong

Plausible Conspiracy

Stigler-Friedman Cartel Sustainability & Deviation Frontier Cartel collusive equilibrium sustained when δ > δ*

Low Discipline (Easy Cheating) Operating Point (Current Scenario) Tight Enforcement Frontier

Legal Scrutiny & Judicial Standard Matrix

Doctrine / Element	Observation	Legal Weight	Status

Executive Counsel Assessment

Antitrust Law Framework: Conscious Parallelism vs. Illegal Cartelization

The Sherman Act § 1 Standard

Section 1 prohibits contracts, combinations, or conspiracies in restraint of trade. Pure "conscious parallelism" (tacit following of rivals without agreement) is lawful under Theatre Enterprises v. Paramount (1954). Plaintiffs must prove an actual meeting of minds or agreement.

The Pleading Gate: Twombly

Under Bell Atlantic Corp. v. Twombly (2007), plaintiffs cannot survive a Rule 12(b)(6) motion to dismiss by alleging parallel behavior alone. They must plead specific factual context ("plus factors") pointing toward agreement rather than independent self-interested competition.

Coordinated AI Slowdowns

When competitors collectively agree to restrict release speeds, limit computing benchmarks, or pause frontier releases under the umbrella of safety, antitrust scrutiny examines whether the agreement serves as an anticompetitive output cap preventing dynamic technological disruption.