- Official section
- National X.C: Antitrust Laws
- Broker weight
- Part of 12% of the national portion
- Expected scored items
- The current PSI broker outline assigns about 12 of 100 scored national items to Practice of Real Estate
Competition-law comparison
Antitrust violation comparison
Start with independence. A brokerage chooses its own fees, clients, territory, vendors, discounts, service model, and bids. When competing firms replace independent choice with coordination, the label follows what they coordinated: price, market, customers, bids, or a refusal to deal. Do not confuse a shared outcome with proof of a shared plan.
Last updated: August 1, 2026
What is the difference at a glance?
Short answer: Price fixing coordinates price or price-related terms. Market allocation divides customers, territories, property types, leads, or other competitive space. A group boycott coordinates refusals to deal. Bid rigging turns supposed bids into a planned outcome. Tying conditions one product on a separate product and requires additional competition facts. Monopolization requires more than size or success. The recurring broker-exam question is whether competitors acted independently or reached an agreement. The agreement can be written, spoken, or inferred from evidence, but identical commissions or business decisions alone do not automatically prove collusion.
Antitrust liability depends on market definition, agreement evidence, competitive effect, market power, business justification, immunity, statutory coverage, and current case law. Some naked competitor agreements are treated as inherently unlawful, while other conduct receives a fuller competitive-effects analysis. This guide teaches exam classification and broker risk recognition, not legal or compliance advice. Sources were checked through August 1, 2026.
What changes from one term to the next?
- Terms
- Price fixing vs. parallel pricing
- Difference
- Price fixing requires competitor coordination. Parallel pricing can arise when firms independently react to the same costs, demand, or public information.
- Question cue
- Shared plan versus similar result.
- Terms
- Market allocation vs. specialization
- Difference
- Allocation divides customers or territory by agreement. Specialization is one firm's independent choice based on expertise or business capacity.
- Question cue
- Reciprocal boundary versus solo strategy.
- Terms
- Group boycott vs. unilateral refusal
- Difference
- A group boycott coordinates refusals among competitors. A unilateral refusal is one firm's independent choice not to deal.
- Question cue
- Rivals act together versus one firm decides.
- Terms
- Bid rigging vs. competitive bidding
- Difference
- Bid rigging prearranges winners or submissions. Competitive bidding requires each bidder to decide price and terms independently.
- Question cue
- Staged competition versus real competition.
- Terms
- Tying vs. optional package
- Difference
- Tying conditions a desired product on taking another separate product. An optional package preserves the customer's ability to select services independently.
- Question cue
- Forced second service versus real choice.
- Terms
- Commission rate vs. property list price
- Difference
- Commission is the price of brokerage service. List price is the seller's asking price for property, chosen by the seller with independent advice.
- Question cue
- Broker service price versus client property price.
- Terms
- Public price observation vs. competitor exchange
- Difference
- A firm can observe public advertisements and respond independently. Direct exchange of future fee plans or discount policies can facilitate coordination.
- Question cue
- Market research versus shared intentions.
- Terms
- Cooperation vs. collusion
- Difference
- Cooperation performs a client transaction under lawful terms. Collusion replaces independent competitive choices with an agreement among rivals.
- Question cue
- Complete the deal versus suppress competition.
- Terms
- Market power vs. business success
- Difference
- Market power is the ability to control price or exclude competition in a relevant market. Success can result from better service without unlawful exclusion.
- Question cue
- Power plus conduct versus winning on merit.
- Terms
- Per se category vs. fuller effects analysis
- Difference
- Naked price fixing, customer or market division, and bid rigging are treated as especially serious. Tying, boycotts, vertical restrictions, and other conduct can require additional facts and legal analysis.
- Question cue
- Do not use one legal shortcut for every restraint.
How does the distinction change the answer?
The minimum commission conversation
Scenario: Owners of three competing brokerages agree over lunch that none will accept a listing below a shared percentage because discounting is hurting the profession.
- The brokerages are competitors for listing clients.
- They agreed on a minimum price for brokerage services.
- A claim that the shared rate is reasonable or protects quality does not restore independent pricing.
Answer: This is price fixing. Each brokerage must set commissions and service terms independently.
The neighborhood swap
Scenario: Two competing firms agree that one will stop soliciting sellers north of a highway if the other stops soliciting south of it.
- The firms could compete on both sides of the highway.
- Their reciprocal promise divides geographic territory.
- Clients lose the benefit of choosing between the firms.
Answer: This is market allocation, even if each firm claims the division improves efficiency.
The coordinated refusal to show
Scenario: Several brokerage owners agree that their agents will not show listings from a new discount firm until that firm raises its fee and stops offering consumer rebates.
- The refusals are coordinated among competing brokerages.
- The target is a price-cutting rival.
- The boycott is used to pressure the rival's competitive terms and can also support price fixing.
Answer: This is a group-boycott red flag with direct price-competition concerns.
The similar rates without contact
Scenario: Three brokerages advertise the same flat fee after separately responding to widely reported portal costs. No owner, employee, or association exchanged fee plans.
- The rates are parallel, but price similarity is not itself an agreement.
- A common public cost can produce similar independent responses.
- Additional evidence would be needed to establish collusion.
Answer: The facts do not automatically prove price fixing; preserve the distinction between parallel conduct and agreement.
The prearranged repair bids
Scenario: Three contractors bidding on a brokerage renovation agree which one will win. The other two submit intentionally high cover bids and rotate the winner on the next projects.
- The customer believes it is receiving independent bids.
- The bidders planned both the winner and the noncompetitive submissions.
- Rotation hides the arrangement over time.
Answer: This is bid rigging through cover bids and bid rotation.
The required affiliated service
Scenario: A company with strong control over a unique property-listing service says brokers can obtain access only if they also purchase a separate transaction-management product from the company.
- Access to one desired product is conditioned on a second product.
- The products, market power, and competitive effect require analysis.
- An affiliated relationship or disclosure alone does not answer the antitrust question.
Answer: This presents a tying issue, but a legal conclusion requires the separate-product, market-power, conditioning, and competitive-harm facts.
How do you classify an antitrust fact pattern?
- Identify each firm, broker, worker, customer, vendor, platform, association, product, service, and relevant competitive relationship.
- Ask whether the decision was independent or coordinated with a competitor.
- Find what was coordinated: price, discount, output, customer, territory, bid, worker, vendor refusal, product condition, or exclusion.
- Match the conduct to price fixing, market allocation, group boycott, bid rigging, tying, information exchange, or monopolization.
- Separate evidence of agreement from mere similarity, observation, specialization, or a lawful unilateral choice.
- For tying and monopolization, identify separate products, market power, competitive harm, and exclusionary conduct before choosing a conclusion.
- Preserve independent brokerage pricing, client choice, genuine bids, lawful referrals, and objective transaction cooperation.
- If a competitor proposes coordination, refuse, end the exchange, preserve the facts, and escalate to the sponsoring broker and antitrust counsel.
- Conduct
- Price fixing
- Competitors coordinate
- Prices or price terms
- Fast exam clue
- Shared commission, fee, rebate, or discount plan
- Conduct
- Market allocation
- Competitors coordinate
- Customers or territories
- Fast exam clue
- You take these clients; we take those
- Conduct
- Group boycott
- Competitors coordinate
- Refusal to deal
- Fast exam clue
- Rivals target a firm, vendor, or price cutter
- Conduct
- Bid rigging
- Competitors coordinate
- Bid outcome
- Fast exam clue
- Winner, cover bids, or rotation planned in advance
- Conduct
- Tying
- Competitors coordinate
- Required second product
- Fast exam clue
- Desired service conditioned on separate service
- Conduct
- Information exchange
- Competitors coordinate
- Sensitive plans or data
- Fast exam clue
- Future fees or strategy shared
- Conduct
- Monopolization
- Competitors coordinate
- Not necessarily an agreement
- Fast exam clue
- Market power maintained by exclusionary conduct
- Conduct
- Parallel conduct
- Competitors coordinate
- Nothing necessarily
- Fast exam clue
- Same outcome can reflect independent market response
Where do similar terms create traps?
- Trap
- Identical commission rates automatically prove price fixing.
- Correction
- Parallel pricing can result from independent market decisions; the violation requires agreement or coordination evidence.
- Trap
- A reasonable commission agreement is lawful.
- Correction
- Competing firms cannot defend a naked price agreement by saying the agreed price is fair or necessary.
- Trap
- Price fixing only means raising prices.
- Correction
- Agreements to raise, lower, maintain, stabilize, cap, floor, or coordinate price-related terms can qualify.
- Trap
- A brokerage may never specialize in one property type.
- Correction
- Independent specialization is allowed; the antitrust problem is an agreement with competitors to divide the market.
- Trap
- One firm choosing not to use a poor vendor is a group boycott.
- Correction
- A boycott requires coordinated refusal; an independently documented vendor decision is different.
- Trap
- Every bundled real estate service is an illegal tie-in.
- Correction
- Tying analysis considers separate products, conditioning, market power, consumer choice, and competitive effect.
- Trap
- A trade association can publish an agreed minimum fee because it represents the industry.
- Correction
- Association status does not shield competitor price coordination.
- Trap
- A verbal agreement cannot violate antitrust law.
- Correction
- An agreement can be written, verbal, or inferred from evidence and conduct.
- Trap
- Competitors may exchange future rates if no one promises to follow them.
- Correction
- Sensitive future-price exchanges can facilitate coordination and require immediate compliance review.
- Trap
- A monopoly is illegal whenever one firm becomes the largest.
- Correction
- Monopolization requires market power and anticompetitive acquisition or maintenance, not size or success alone.
- Trap
- Client loyalty requires joining a competitor boycott.
- Correction
- Agency duties do not authorize collective restraints; make lawful transaction and business decisions independently.
- Trap
- Deleting the group chat removes the problem.
- Correction
- Do not destroy records. Stop participation, preserve facts, and obtain qualified antitrust and brokerage guidance.
Can you separate the terms in a new fact pattern?
These questions are original study items aligned to the published outline. They are not copied, recalled, or predicted PSI questions.
1. Competing brokerage owners agree that none will charge below the same commission rate. What is the clearest violation?
- Price fixing
- Market allocation
- Tying
- Independent pricing
Show answer and explanation
Answer: Price fixing
The competitors coordinated a minimum price for brokerage services.
2. Two competing firms agree to divide seller clients by ZIP code. What is this?
- Market allocation
- Bid rigging
- Unilateral refusal
- Lawful specialization
Show answer and explanation
Answer: Market allocation
The firms divided geographic customers instead of competing independently.
3. Several firms agree not to show a discount broker's listings until it raises its fee. Which label best fits?
- Group boycott
- Independent vendor choice
- Tying
- Property management
Show answer and explanation
Answer: Group boycott
Competing firms coordinated a refusal to pressure a price-cutting rival.
4. Three contractors secretly plan the winning bid and submit cover bids. What is the conduct?
- Bid rigging
- Price comparison
- Open competition
- Commission negotiation
Show answer and explanation
Answer: Bid rigging
The bidders staged competition and arranged the winner before submission.
5. Three brokerages independently choose the same fee after observing public costs, with no coordination evidence. Which statement is most accurate?
- Similar fees alone do not prove price fixing
- Price fixing is automatic
- The firms allocated customers
- The firms formed a boycott
Show answer and explanation
Answer: Similar fees alone do not prove price fixing
Antitrust price fixing requires an agreement, not price similarity alone.
Where do these ideas appear on the outline?
- Topic
- Purpose and governing laws
- What to know
- Competition, consumer choice, independent firms, lower prices, quality, innovation, Sherman Act Section 1, Sherman Act Section 2, Clayton Act, Federal Trade Commission Act, civil enforcement, criminal enforcement, private suit, state law, and real estate services
- Best exam move
- Choose the answer that preserves independent competitive decision-making rather than a supposedly fair industry-wide rule.
- Topic
- Competitor agreement
- What to know
- Contract, combination, conspiracy, written term, verbal promise, handshake, text, meeting, wink, invitation, acceptance, course of conduct, circumstantial evidence, parallel conduct, plus factor, direct evidence, independent decision, and no agreement
- Best exam move
- Find the meeting of competitive decisions before labeling similar outcomes an antitrust conspiracy.
- Topic
- Price fixing
- What to know
- Raise, lower, maintain, stabilize, range, minimum, maximum, commission, fee, split, rebate, discount, credit term, service package, output, customer charge, buyer-broker price, listing price service, and competitor coordination
- Best exam move
- Choose price fixing whenever competitors agree on a price or a term that meaningfully affects price.
- Topic
- Commission independence
- What to know
- Brokerage policy, negotiability, independent rate, client agreement, service level, cost, value, market response, public advertisement, competitor observation, no standard commission, no board rate, sales script, sponsoring broker, discount, and documented authority
- Best exam move
- A firm may set its own fee, but may not justify it as the rate competitors, the board, or the industry agreed everyone will charge.
- Topic
- Market allocation
- What to know
- Geographic territory, neighborhood, county, ZIP code, customer, seller, buyer, landlord, tenant, lead, referral, property type, price band, new construction, resale, commercial, residential, rotation, noncompetition pact, and division
- Best exam move
- Choose allocation when competitors divide who or where they will serve instead of winning business independently.
- Topic
- Independent specialization
- What to know
- Skill, language, experience, marketing budget, office location, property expertise, service capacity, independent plan, public niche, referral, client choice, expansion, no promise to rival, no reciprocal territory, and no lead division
- Best exam move
- Specialization is not market allocation unless competitors coordinate the boundaries or customers.
- Topic
- Group boycott
- What to know
- Competitors, coordinated refusal, target brokerage, discount broker, vendor, platform, listing service, customer, supplier, appraiser, lender, price cutter, unfavorable term, exclusion, pressure, market power, enforcement, and competitive harm
- Best exam move
- Choose group boycott when rivals collectively refuse to deal or pressure others to refuse.
- Topic
- Unilateral refusal
- What to know
- Independent business choice, poor service, late delivery, conflict, compliance, credit risk, capacity, vendor performance, documentation, no competitor discussion, no collective demand, alternative supplier, and firm policy
- Best exam move
- One firm can generally choose a business partner on its own; the exam risk begins when competitors coordinate the refusal.
- Topic
- Bid rigging
- What to know
- Competitive bid, winning bidder, cover bid, complementary bid, bid suppression, bid rotation, subcontract, kickback, preselected winner, inflated price, auction, procurement, repair contract, property service, and staged competition
- Best exam move
- If supposed competitors arrange the winner or bids before submission, choose bid rigging.
- Topic
- Tying arrangement
- What to know
- Tying product, tied product, separate products, condition, forced purchase, market power, customer choice, affected commerce, competitive foreclosure, package, bundle, discount, integrated service, optional referral, affiliated provider, disclosure, and consent
- Best exam move
- Do not call every bundle illegal; look for forced linkage, power in the first product, and competitive harm in the second.
- Topic
- Information exchange
- What to know
- Current price, future price, fee floor, planned increase, discount policy, cost, capacity, output, customer identity, territory plan, bid, business strategy, salary, commission split, aggregated data, historical data, public data, third party, and trade association
- Best exam move
- Competitively sensitive future information can help rivals coordinate even without a formal rate sheet.
- Topic
- Trade associations and meetings
- What to know
- Education, advocacy, standards, ethics, membership, meeting, agenda, minutes, side conversation, chat group, social event, benchmark, survey, sensitive data, membership restriction, discipline, rule, and antitrust review
- Best exam move
- Association sponsorship does not legalize conduct that would be unlawful if competitors planned it privately.
- Topic
- Monopolization
- What to know
- Relevant market, market power, dominant firm, acquisition, maintenance, exclusionary conduct, entry barrier, predatory act, competition on merits, superior product, efficiency, size, high price, attempt, specific intent, and dangerous probability
- Best exam move
- Large market share alone is not the violation; look for power plus anticompetitive conduct.
- Topic
- Brokerage cooperation
- What to know
- Listing access, showing, offer presentation, transaction cooperation, independent compensation, written agreement, objective qualification, service standard, lawful platform rule, competitor status, client interest, refusal, retaliation, and sponsoring broker review
- Best exam move
- Cooperation on a transaction does not authorize coordination of each firm's competitive policies.
- Topic
- Employment and contractor confusion
- What to know
- Brokerage, sponsored licensee, independent contractor, employee, internal supervision, one firm, separate firms, team, franchise, joint venture, competitor, compensation plan, wage fixing, no-poach agreement, and worker market
- Best exam move
- Internal policy within one economic firm differs from an agreement between competing firms or employers.
- Topic
- Client instructions and seller pricing
- What to know
- Seller list price, buyer offer, broker fee, client negotiation, comparative market analysis, independent advice, market evidence, competitor listing, coordinated price, neighborhood pact, developer restriction, and lawful agency duty
- Best exam move
- A client chooses a property price with advice; competing brokers may not agree to keep service fees or client prices at a shared level.
- Topic
- Evidence and red flags
- What to know
- Competitor call, group text, secret meeting, identical unusual term, enforcement threat, retaliation against discounter, customer list, territory map, rotating winner, cover bid, invitation to match, deletion, false explanation, contemporaneous record, and preservation
- Best exam move
- Focus on communications and conduct connecting competitors rather than assuming coincidence is enough.
- Topic
- Broker response
- What to know
- Refuse coordination, end discussion, state objection, leave meeting, preserve record, no deletion, sponsoring broker, compliance officer, antitrust counsel, independent pricing, documented decision, no retaliation, no customer allocation, training, and lawful reporting
- Best exam move
- Choose the answer that stops participation, preserves evidence, and routes the issue for qualified review.
How do you make the distinction stick?
- Session
- Session 1
- Focus
- Find the agreement
- Proof you are ready
- Separate independent conduct, parallel conduct, invitations, sensitive exchanges, and actual coordination in 25 examples.
- Session
- Session 2
- Focus
- Compare the four core exam violations
- Proof you are ready
- Classify 30 facts as price fixing, market allocation, group boycott, bid rigging, or none of the four.
- Session
- Session 3
- Focus
- Master real estate pricing facts
- Proof you are ready
- Analyze commission rates, flat fees, discounts, rebates, splits, property list prices, public ads, and competitor conversations.
- Session
- Session 4
- Focus
- Handle tying and market power
- Proof you are ready
- Identify separate products, conditioning, alternatives, market power, foreclosure, and competitive effect in 12 bundles.
- Session
- Session 5
- Focus
- Audit meetings and broker responses
- Proof you are ready
- Practice leaving discussions, stating objections, preserving records, escalating, and documenting independent decisions in 15 scenarios.
- Session
- Session 6
- Focus
- Complete a mixed antitrust set
- Proof you are ready
- Score at least 90% and justify every answer by competitor status, agreement evidence, coordinated term, consumer effect, and safe response.
Do not count recognition as mastery. Close the notes and explain the rule, apply it to a new fact pattern, and identify why each distractor fails.
Turn the comparison into a test-day decision
From concept to decision
Drill this topic, then review the explanation
Pass Illinois gives you original national and Illinois questions, topic-by-topic study, clear explanations, timed practice, flashcards, progress tracking, and Math Coach. Start free, find the weak distinction, and focus the next session there.
Questions students ask about Antitrust Violation Comparison
What is price fixing in real estate?
Price fixing is an agreement among competitors to raise, lower, maintain, stabilize, or otherwise coordinate prices or price-related terms. In real estate, it can involve commission rates, fees, splits, discounts, rebates, service charges, or other competitive terms. Each independent brokerage must make its own pricing decisions.
Do identical commission rates prove price fixing?
No. Similar prices can result from independent responses to the same market. The antitrust clue is an agreement, understanding, invitation accepted through conduct, or other coordination among competitors. A written contract is not required, but parallel pricing by itself does not automatically prove a conspiracy.
What is market allocation?
Market allocation is an agreement among competitors to divide territories, customers, property types, price bands, leads, or other parts of a market instead of competing for them. A broker may independently specialize, but competing brokers may not agree to stay out of each other's assigned market.
What is a group boycott?
A group boycott is coordinated refusal by competitors to deal with a targeted person or business, especially when used to enforce price terms, exclude a rival, or restrict competition. One business may usually choose its own partners independently; the exam danger is the competitors' agreement.
What is bid rigging?
Bid rigging is collusion among supposed competitors about who will win, who will submit a cover bid, who will refrain, or how prices will be rotated. The customer receives staged competition instead of genuine independent bids.
What is an illegal tie-in arrangement?
A tying arrangement conditions access to one product or service on taking a separate product or service. Tying is not automatically unlawful in every package. Antitrust concern generally depends on facts such as separate products, conditioning, market power in the tying product, and harm to competition in the tied market.
May competing real estate brokers discuss commission rates?
Competitors should not exchange present or future commission plans, fee floors, discount policies, customer allocations, or other competitively sensitive intentions. Publicly available market observation is different from asking a competitor to coordinate future terms.
Does a trade association protect competitors from antitrust law?
No. A lawful association can provide education, standards, advocacy, and other legitimate services, but it cannot be used as a meeting place or mechanism for price coordination, customer division, boycotts, or sensitive information exchange that restrains competition.
Is having a monopoly automatically illegal?
No. A firm does not violate antitrust law merely because it is large, successful, or charges a high price. Monopolization generally requires market power plus anticompetitive conduct used to acquire or maintain that power, rather than success through competition on the merits.
Are these official PSI Illinois real estate exam questions?
No. They are original questions aligned to the national Practice of Real Estate outline effective June 24, 2026. Federal primary sources were reviewed through August 1, 2026.
Primary sources
- PSI Illinois Candidate Information Booklet dated June 24, 2026
- 15 USC 1, Sherman Act restraint-of-trade text in effect through July 2026
- Federal Trade Commission, current guide to the federal antitrust laws
- Federal Trade Commission, current anticompetitive-practices overview
- Federal Trade Commission, current price-fixing guidance
- Federal Trade Commission, current group-boycott guidance
- Federal Trade Commission, current market-division and customer-allocation guidance
- Federal Trade Commission, current trade-association antitrust guidance
- U.S. Department of Justice Antitrust Division, current antitrust-law overview
- U.S. Department of Justice, price-fixing, bid-rigging, and market-allocation warning signs
The current official outline controls the tested scope. Statutes, regulations, and official agency materials control when a general study rule and a jurisdiction-specific rule differ.
Editorial status
Checked against primary sources
The Pass Illinois editorial team last checked this guide on August 1, 2026. Every practice question is an original study item, and the source links above let you verify the rules that support the lesson.