AI Antitrust Compliance Policy Writing Guide 2026: A Structured Framework for Market Definition, Monopoly Agreements, and Merger Review

An antitrust compliance policy is not a declaration that "the company will comply with competition laws" — it is a risk control document that determines whether pricing agreements with competitors are lawful, whether exclusive dealing with distributors constitutes abuse, and whether a merger triggers review obligations. The problem with most antitrust policies is that market definition is vague ("we operate in the technology sector" — which relevant market?) and monopoly agreements are listed generically ("no price-fixing" — what about information exchange? bid-rigging? market allocation?). The biggest trap when using AI to write an antitrust policy is asking it to "write a standard antitrust template" — antitrust laws vary by jurisdiction and your actual market share, competitor relationships, and distribution model determine what's risky. What's useful is quantifying your relevant market, identifying specific risky conduct, and establishing pre-clearance procedures.

I. The Five-Element Structure of an Antitrust Compliance Policy

An enforceable antitrust policy contains five elements: Market Definition and Position Assessment (what is your relevant market — product + geography, and what is your market share), Monopoly Agreement Prohibitions (horizontal agreements with competitors — price-fixing/market allocation/bid-rigging/information exchange, and vertical agreements with downstream — resale price maintenance/exclusive territory), Abuse of Dominant Position Prohibitions (if you have dominance — predatory pricing/tying/refusal to deal/discriminatory pricing/exclusive dealing), Concentration/Merger Review (when M&A triggers notification thresholds and review procedures), and Compliance Review and Penalty Mitigation (internal review workflow, leniency application, penalty reduction). The five elements are sequential: without market definition you don't know if rules apply, without monopoly agreement prohibitions you risk criminal collusion, without abuse prohibitions dominant firms face massive fines, without concentration review mergers get unwound, without compliance mechanisms penalties are not mitigated.

"I need to write an antitrust compliance policy for [company type/industry/market position]. Here are the business model, market share data, and competitor relationships: [paste]. Please organize by five elements: 1.Market Definition and Position (relevant product market — what products compete with yours; relevant geography market — national/regional/local; market share calculation — revenue/units/users; position assessment — dominant (>50%)/significant (20-50%)/non-dominant (<20%)) 2.Monopoly Agreement Prohibitions (horizontal: price-fixing/quantity-limiting/market-allocation/bid-rigging/information-exchange with competitors — all prohibited; vertical: resale price maintenance (RPM)/exclusive territory/non-compete with distributors — conditional legality) 3.Abuse of Dominant Position (only applies if dominant — predatory pricing (below cost)/tying and bundling/refusal to deal/discriminatory pricing/exclusive dealing — all prohibited if dominant) 4.Concentration Review (M&A meeting turnover/asset thresholds → pre-notification to antitrust authority → review period 30-180 days → clearance/conditional clearance/blocked) 5.Compliance Review and Penalty Mitigation (pre-clearance for high-risk conduct/leniency application for discovered collusion/penalty 1-10% of annual turnover). Standards must be quantified."

II. Market Definition and Position Assessment: The Foundation

Market definition determines whether antitrust rules apply and how strictly. Two dimensions: Relevant Product Market (what products are substitutes — demand-side substitutability: can customers switch? supply-side: can other producers switch? The narrower the market, the higher your share), Relevant Geography Market (national/regional/local — where can customers practically buy? Cross-border is relevant only if customers can easily buy abroad). Position assessment: Dominant (market share >50% — subject to full abuse-of-dominance rules), Significant (20-50% — some scrutiny but no abuse obligations), Non-dominant (<20% — minimal antitrust risk except monopoly agreements). Market share should be calculated by revenue, units, or active users, and reassessed annually.

"Here are the product portfolio, geographic coverage, and competitor data: [paste]. Please detail market definition + position assessment: 1.Relevant Product Market (①demand-side substitutability: can customers switch to alternatives? Price elasticity test — 5-10% price increase, do customers switch? ②supply-side substitutability: can other producers switch to your product within 6-12 months? ③market scope: narrowly defined (smartphone OS) vs broadly defined (mobile operating systems) — narrower = higher share ④multi-sided platforms: define each side separately (e.g., ride-hailing: passenger side + driver side)) 2.Relevant Geography Market (①customer mobility: can customers buy from other regions? Shipping costs, regulations, language barriers ②supply coverage: national (online services)/regional (physical retail)/local (taxi/food delivery)③cross-border: relevant only if customers practically buy abroad ④emerging markets: may be broader initially, narrow as competition develops) 3.Market Share Calculation (①by revenue: your revenue / total market revenue ②by units: your units / total market units ③by active users (platforms): your MAU / total market MAU ④data sources: industry reports (IDC/Gartner)/regulator data/internal estimates with methodology disclosed ⑤reassess annually, document methodology) 4.Position Assessment (①dominant: >50% — full abuse-of-dominance obligations ②significant: 20-50% — scrutiny on vertical agreements and information exchange ③non-dominant: <20% — focus on horizontal monopoly agreements only). Generate position matrix: product market|geography market|your share|position tier|applicable rules."

III. Monopoly Agreement Prohibitions: Horizontal + Vertical

Monopoly agreements are the most common antitrust violation — and the most severely punished (criminal liability in many jurisdictions). Horizontal agreements (between competitors at the same level — always high-risk): Price-fixing (agreeing on prices/discounts/credit terms — per se illegal, no defense), Quantity-limiting (agreeing on output/production limits — per se illegal), Market allocation (dividing customers/territories/products — per se illegal), Bid-rigging (coordinating bids — one wins, others deliberately lose — per se illegal, criminal), Information exchange (sharing future pricing/plans/customer lists/cost data — can facilitate collusion, must use clean teams and aggregated data only). Vertical agreements (between firms at different levels — manufacturer and distributor): Resale Price Maintenance (RPM) (forcing distributors to sell at a fixed/minimum price — illegal in most jurisdictions, maximum price may be permissible), Exclusive territory (restricting distributors to specific regions — may be lawful if non-dominant, unlawful if dominant), Non-compete clauses (post-termination non-compete for distributors — time/geometry limits required).

"Here are the competitor relationships, trade association memberships, and distribution model: [paste]. Please detail monopoly agreement prohibitions: 1.Horizontal Agreements (with competitors — ALL high-risk) ①price-fixing: agreeing on prices/discounts/credit terms/promotions — per se illegal, no justification defense ②quantity-limiting: agreeing on output/production/sales limits — per se illegal ③market allocation: dividing customers/territories/products — per se illegal ④bid-rigging: coordinating who wins a tender (one bids low, others bid high or don't bid) — per se illegal, criminal liability ⑤information exchange: sharing future pricing/production plans/customer lists/cost data — must use clean teams (personnel not involved in pricing)/aggregated data only (no individual company data)/historical data only (no forward-looking)/third-party data aggregation. Trade association meetings: minutes recorded, legal review of agendas, no informal discussions of pricing) 2.Vertical Agreements (manufacturer-distributor) ①RPM: forcing fixed/minimum resale price — illegal; maximum resale price or recommended price (clearly non-binding) may be permissible ②exclusive territory: restricting distributor to specific region — lawful if non-dominant (<20%), unlawful if dominant ③exclusive dealing: requiring distributor to carry only your products — unlawful if dominant or long-term ④non-compete: post-termination restriction — must be limited in time (≤2 years) and geography (reasonable scope) ⑤MFN (most-favored-nation): guaranteeing you get best terms — may be unlawful if dominant. Generate conduct matrix: type|specific conduct|legality|applicable condition|risk level."

IV. Abuse of Dominant Position: What Dominant Firms Cannot Do

Abuse of dominance rules apply ONLY to firms with dominant market share (>50% in the relevant market). Non-dominant firms face no abuse obligations. Six categories of abuse: Predatory pricing (selling below cost to drive competitors out — cost benchmark: average variable cost; below AVC = presumed predatory, between AVC and ATC = may be predatory if evidence of exclusionary intent), Tying and bundling (forcing customers who want product A to also buy product B — unlawful if dominant and products are separate), Refusal to deal (refusing to supply existing customers or deal with new ones — generally lawful unless the customer is dependent or it's essential infrastructure), Discriminatory pricing (charging different prices to equally situated customers without cost justification — unlawful if dominant), Exclusive dealing (requiring customers/distributors to buy exclusively from you — unlawful if dominant and long-term), Leveraging (using dominance in market A to gain advantage in market B — unlawful).

"Here are the market share data and business practices: [paste]. Please detail abuse of dominant position rules (ONLY if share >50%): 1.Predatory Pricing (①cost benchmark: average variable cost (AVC) — below AVC = presumed predatory; between AVC and average total cost (ATC) = may be predatory if exclusionary intent proven ②pricing review: all pricing below ATC requires compliance pre-approval ③defense: below-cost pricing for new product launch (≤6 months)/clearance/perishable goods may be justified) 2.Tying and Bundling (①separate products: if A and B are separate products (customers want them separately), tying is unlawful for dominant firms ②justification: technical necessity (products must work together)/single-product defense (A+B is one product) ③pure bundling (sold only as bundle) vs mixed bundling (sold separately but bundle discount) — pure bundling higher risk) 3.Refusal to Deal (①general rule: firms may choose customers, even dominant ones ②exceptions: essential facility (infrastructure competitors cannot replicate — must provide access at reasonable terms)/dependent customer (long-term customer suddenly cut off without cause)/regulatory mandate) 4.Discriminatory Pricing (①unlawful if: dominant + charging different prices to equally situated customers (same volume/conditions) without cost justification ②lawful if: volume discounts (cost-justified)/new customer promotions (≤6 months)/regional cost differences) 5.Exclusive Dealing (①unlawful if: dominant + exclusive dealing long-term (≥2 years) or covers significant market share ②lawful if: non-dominant or short-term (≤1 year) or small share of market) 6.Leveraging (using dominance in market A to force entry or advantage in market B — unlawful). Generate abuse matrix: conduct|legality (dominant)|defense|pre-approval requirement."

V. Common Mistakes Checklist

• No market definition: don't know your share. Fix: define product + geography market, calculate share annually
• "We're not dominant so antitrust doesn't apply": wrong. Fix: monopoly agreements apply to ALL firms regardless of share
• Trade association meetings without controls: informal pricing discussions. Fix: legal review of agendas, minutes, clean teams
• RPM on distributors: fixed/minimum resale price. Fix: recommended price (clearly non-binding), maximum may be permissible
• Dominant firm pricing below cost: predatory. Fix: all below-ATC pricing requires compliance pre-approval
• Tying separate products: forcing bundle. Fix: offer separately unless technical necessity
• No leniency application process: discovered collusion unaddressed. Fix: leniency application procedure for self-reporting

VI. Complete Example

Company: Tech platform with 55% market share in relevant market.
Market Definition: Relevant product market = ride-hailing platform services (passenger side + driver side). Geography = national. Share = 55% by MAU (dominant).
Monopoly Agreement Prohibitions: No price-fixing/quantity-limiting/market-allocation/bid-rigging with competitors. Trade association meetings: legal review of agenda + minutes + clean teams + aggregated/historical data only (no forward-looking individual data). RPM: no fixed/minimum resale price for drivers — recommended price only (clearly non-binding).
Abuse of Dominance (applies — share >50%): ①Predatory pricing — all below-ATC pricing requires compliance pre-approval, below AVC presumed predatory ②Tying — driver app and passenger app are separate products, must be available separately ③Refusal to deal — may refuse drivers only for documented safety/compliance violations ④Discriminatory pricing — no different commission rates to equally situated drivers without cost justification ⑤Exclusive dealing — no requiring drivers to work exclusively on platform (≤1 year incentive programs may be lawful) ⑥Leveraging — no using ride-hailing dominance to force food delivery market entry.
Concentration Review: M&A exceeding turnover threshold (national: combined turnover ≥X billion) or asset threshold → pre-notification to antitrust authority → 30-180 day review → clearance/conditional clearance/blocked.
Compliance Review: Pre-clearance for below-ATC pricing/exclusive deals >1 year/M&A above thresholds. Leniency: if collusion discovered, first-in leniency application within 10 working days. Penalties: 1-10% of annual turnover.

This article focuses on antitrust compliance policy writing. When building a complete compliance system, also see AI Code of Conduct Writing Guide (employee conduct and trade association rules), AI Audit Report Writing Guide (antitrust special audit methods), and AI Compliance Training Plan Writing Guide (antitrust training for sales and BD teams).

Frequently Asked Questions

Q1: We attend industry trade association meetings — is that risky?

Trade association meetings are high-risk for antitrust because competitors are in the same room. Risky conduct: informal discussions about pricing, production plans, customer allocation, or future strategy — even in hallways or dinners. Safe conduct: ①legal/compliance review of the meeting agenda in advance ②minutes recorded and retained ③legal counsel present for pricing-sensitive topics ④clean teams — personnel involved in pricing do not attend ⑤if pricing comes up, immediately object on the record and leave ⑥only share aggregated, historical data (never individual company forward-looking data). If a competitor raises pricing, document your objection and report to compliance within 24 hours. The safest rule: if you wouldn't want it read in a regulator's subpoena, don't say it.

Q2: We set a "suggested retail price" for our distributors — is that RPM?

Depends on whether it's truly non-binding. A "suggested" or "recommended" retail price that distributors are free to deviate from is generally lawful — it's not RPM. But if you: ①threaten to cut supply if distributors sell below the suggested price ②monitor and penalize deviations ③use the "suggestion" as a floor in practice — then it becomes de facto RPM (resale price maintenance), which is illegal. The test: can a distributor sell below the suggested price without consequences? If yes, it's a lawful recommendation. If no, it's unlawful RPM. Safe approach: clearly label as "recommended price, non-binding" in contracts, do not monitor compliance with the recommended price, and do not penalize deviations. Maximum resale price (price ceiling) may be permissible in some jurisdictions but consult counsel.

Q3: Our market share is only 15% — do abuse-of-dominance rules apply to us?

No. Abuse-of-dominance rules apply only to firms with a dominant market position, generally defined as >50% share in the relevant market (some jurisdictions: >40% or >33% with specific factors). At 15%, you are non-dominant and have no abuse-of-dominance obligations. You can: set prices (even below cost for legitimate reasons like new product launch or clearance), tie products, refuse customers, offer exclusive deals. BUT: monopoly agreement rules apply to ALL firms regardless of share — you cannot price-fix, allocate markets, rig bids, or exchange forward-looking individual data with competitors, even at 15%. The antitrust risk for non-dominant firms is almost entirely horizontal collusion, not abuse of dominance. Reassess your share annually — if it crosses 20% (significant) or 50% (dominant), additional obligations kick in.

Author: UseAIWriter Editorial | Updated: 2026-10-27 | Written by UseAIWriter Editorial. Please cite the source when reposting.