How to build a case law research matrix for Antitrust Conduct Disputes

Build an antitrust case law research matrix by defining the disputed conduct and legal question, reading relevant opinions, and recording each holding with its jurisdiction, procedural posture, restraint analysis, factual fit, and subsequent treatment. Link comparisons to the operative pleading and matter documents without treating disputed facts as established. The deliverable is a source-linked table and short synthesis showing which authorities support an argument, which undermine it, and what counsel must verify before drafting a motion, advising the business, or preparing for argument.

When to use this workflow

Use this workflow when litigation counsel or an in-house team must assess authorities concerning competitor communications, distribution restrictions, dealer complaints, exclusionary conduct, or another identified antitrust theory. Triggers include preparing a motion, testing an opponent’s citations, or deciding whether newly collected communications change an existing analysis.

Research the question presented, not everything labeled “antitrust.” Separate agreement questions from restraint classification, competitive effects, injury, and other issues implicated by the pleaded claim. The examples below concern pricing and distribution disputes; an exclusionary-conduct assignment requires different issue rows and authorities.

This guide principally addresses US federal civil litigation. Identify the forum, controlling circuit, pleaded state claims, and procedural setting. State proceedings, arbitration, agency investigations, and criminal matters need separate analysis. Use October 13, 2026 as the assigned research cutoff, not as an assertion that every authority has received a complete treatment check. This is a general professional workflow, not advice for a particular dispute.

What you need

Assemble a focused research packet:

• Operative claims and questions: complaint, answer, relevant motion papers, and the propositions counsel needs to evaluate.
• Forum and posture: court, controlling jurisdiction, applicable state claims, motion type, and relevant orders.
• Conduct description: participants, competitive relationships, products, geography, period, and alleged restraint.
• Source-linked facts: communications, pricing approvals, transaction records, dealer agreements, amendments, and enforcement correspondence, identified by document ID and pinpoint.
• Research materials: full opinions, related decisions, cited authorities, and subsequent-treatment results—not only headnotes or summaries.
• Assignment boundaries: cutoff date, researcher, reviewer, priority questions, and intended work product.

Keep allegations, evidence, and counsel’s inferences distinguishable. For a pleading-stage assignment, start with complaint paragraph references. Maintain internal documents separately so factual comparisons do not silently change the record being analyzed.

Use the template

The companion template is Antitrust Conduct Disputes — Case law research matrix. Copy this table into your working document or spreadsheet. Use one row per material proposition; one opinion may support several rows.

Assign stable IDs such as R-01. Record the full citation, opinion link, and supporting page or paragraph in Authority / pinpoint. Court / date / status identifies the deciding court, decision date, and verified precedential status; do not assume every opinion from a relevant court is binding.

Posture / record distinguishes allegations from evidence examined on a developed record. Holding / analysis states the narrow proposition and whether the court applied per se analysis, the rule of reason, another framework, or did not decide classification.

Fact fit / sources identifies similarities, consequential differences, and document or pleading references. Contrary / treatment records adverse authority, later history, treatment-check date, and limitations. Action / owner identifies the next task and responsible lawyer. If a cell becomes lengthy, link it to a research note using the row ID.

Step by step

1. Define the decision and divide the conduct

Write an instruction tied to the immediate deliverable: “Identify authorities addressing whether the complaint plausibly alleges an agreement concerning shipping charges.” Specify forum, posture, and cutoff.

Separate competitor contacts from manufacturer–dealer restrictions, even when the same documents discuss both. Identify the actual pricing component: list prices, discounts, credit, shipping charges, or another term. For exclusionary-conduct claims, identify the challenged practice rather than importing an agreement-focused question.

Record: Create an ID and neutral question for each issue. Keep restraint classification separate from whether an agreement exists; neither question should assume liability.

2. Build the factual comparison

List facts that could make an authority useful or distinguishable: who communicated, whether participants competed, what information passed between them, whether pricing language was mandatory, and what allegedly followed.

Use two layers where necessary: allegations in the operative complaint and internal evidence relevant to advice or later proceedings. Preserve competing explanations and missing material. An incomplete email thread should not become a statement that competitors agreed.

Record: Enter complaint paragraphs and document pinpoints under separate labels. Flag missing attachments, disputed relationships, and uncertain dates. State whether each comparison concerns allegations, established evidence, or an inference requiring verification.

3. Search by jurisdiction, issue, and posture

Search the conduct, legal question, forum, and procedural stage together. Begin with potentially controlling authority, then expand to persuasive decisions. Preserve search terms and databases in an assignment note so another researcher can reproduce important searches.

Keep federal and state questions separate. The FTC’s manufacturer-imposed requirements guidance describes federal rule-of-reason treatment for vertical resale-price restraints and cautions that some state laws differ. That warning identifies additional research; it does not supply the applicable state rule.

Record: Enter candidates with court, date, posture, and authority type. Mark unread results “research lead.” Keep agency guidance outside the judicial-holding field.

4. Extract the precise holding

Read the relevant opinion, not merely its syllabus, and enough surrounding analysis to understand the facts, issue, and disposition. Follow foundational citations when the proposition depends on them. Distinguish majority reasoning from dissents, party arguments, and descriptions of earlier decisions.

For example, Bell Atlantic Corp. v. Twombly, 550 U.S. 544, 556–57 (2007), addresses pleading: factual matter must plausibly suggest agreement; parallel conduct plus a bare conspiracy assertion is insufficient. It does not require proof of agreement at that stage.

Record: Add the holding, pinpoint, posture, disposition, and analysis actually applied. State expressly when the court assumed or reserved an issue.

5. Test factual fit and opposing arguments

For each authority, write the strongest similarity and the most consequential difference. Compare private competitor exchanges with public announcements, contractual restraints with suggested prices, and dealer complaints with evidence of coordinated pressure.

Search the opposing characterization deliberately. An apparently adverse decision may turn on a different record; an apparently favorable decision may rest on facts missing here. Neither distinction should remain implicit.

Record: Link competing rows by ID. Explain whether the authority supports the proposed proposition, limits it, or answers a different question. Assign factual gaps separately from additional legal research.

6. Verify treatment proposition by proposition

Check later history and subsequent treatment through the assigned cutoff. Read consequential later decisions rather than relying only on a treatment symbol. Verify publication status, opinion version, citation, pinpoint, and the proposition’s continued relevance.

Treatment may affect only part of an older opinion. Leegin Creative Leather Products, Inc. v. PSKS, Inc., 551 U.S. 877, 907 (2007), overruled Dr. Miles and directed rule-of-reason treatment of vertical price restraints. Older pricing cases therefore require attention to which proposition counsel proposes to use.

Record: Enter the actual check date, coverage endpoint, material later decisions, reviewer, and access limitations. Mark incomplete checks provisional; do not substitute the assignment cutoff for work not performed.

7. Produce a decision-ready synthesis

Group completed rows by question. Write a short synthesis identifying the strongest authority, opposing authority, factual distinctions, and unresolved work. Cite row IDs so the drafting lawyer can retrace the reasoning.

For a motion assignment, distinguish propositions suitable for the proposed filing from internal factual observations requiring separate procedural analysis. Do not turn the matrix into a collection plan or complete litigation strategy.

Record: Give each open row a concrete action and owner. Identify which propositions are ready for drafting, which require qualifications, and which cannot yet support a recommendation.

Worked example

Fictional scenario: Counsel represents Oriole Parts, a component manufacturer, in a federal civil dispute alleging shipping-charge coordination with competitor Morrow Components and unlawful dealer pricing restrictions. Counsel is researching a contemplated pleading-stage motion.

Fictional complaint C-01 ¶¶18–24 alleges parallel shipping charges and trade-association contact. Paragraphs 31–36 allege a mandatory minimum resale-price agreement and dealer complaints. Internal email OP-014 p. 2 discusses shipping costs but lacks its referenced attachment. OP-029 pp. 3–4 contains a cost forecast. Executed agreement OP-041 §4 contains the alleged minimum-price term. These internal records are for counsel’s factual assessment, not automatically the motion record.

The judicial authorities below are real; all matter parties, documents, allegations, and facts are fictional. These representative entries identify genuine holdings but remain provisional pending circuit research and complete treatment review through the assigned cutoff.

The matrix changes the proposed argument. R-01 directs attention to the complaint’s complete alleged context rather than a defense cost forecast. R-02 identifies the federal analytical framework without resolving liability. R-03 prevents counsel from treating dealer complaints as conclusive—or applying a trial evidentiary burden as the pleading standard. Missing enforcement records and the absent attachment remain factual gaps, not invented evidence.

Common mistakes

• Combining unlike restraints. Separate competitor coordination from vertical pricing and exclusionary-conduct questions.
• Converting pleading analysis into proof requirements. Record posture and identify exactly what the court required at that stage.
• Using internal evidence as though pleaded. Label each source and assess its procedural use separately.
• Treating guidance or a dissent as a holding. Identify authority type and the opinion section supporting the proposition.
• Applying treatment labels to entire opinions. Check the particular proposition and document material later developments.
• Collecting only favorable cases. Record adverse authority or the opposing-authority search and its limitations.

Final quality check

• Every row answers a defined conduct-specific question.
• Court, decision date, authority type, status, and posture are explicit.
• Holdings and pinpoints match the original majority opinion.
• Allegations, internal evidence, and inferences remain distinguishable.
• Federal doctrine and state-law questions are separated.
• Contrary authority and subsequent-treatment coverage are documented.
• Open issues have owners; provisional rows remain visibly qualified.

Complete the workflow with DecoverAI

DecoverAI is the Legal Intelligence Platform for litigation and transactions. Its document review, evidence analysis, and chronology capabilities can support factual comparisons underlying the matrix; its trial preparation capabilities support work with the litigation record. The matrix remains counsel’s work product. Lawyers retain responsibility for authority research, treatment checks, procedural use of documents, and legal conclusions. To discuss this document-grounded workflow, book a demo.

Frequently asked questions

Should horizontal and vertical restraints share one matrix?

They can share a file, but use separate question IDs or sections. Cross-reference overlapping facts without assuming the same restraint analysis governs each relationship.

How many cases should each question contain?

Include enough verified authority to support the decision and expose uncertainty. Add cases for distinct jurisdictions, factual comparisons, postures, or opposing reasoning—not citation volume alone.

Can agency guidance replace missing case law?

No. Use it to identify terminology and research questions, labeled as guidance. An unresolved judicial-authority search remains an open task rather than a completed holding entry.

Can an opinion from another procedural stage help?

Yes, if the proposition is useful and its limitation is explicit. Separate analytical guidance from stage-specific burdens, and seek authorities addressing the present posture before recommending reliance.

Sources

• Bell Atlantic Corp. v. Twombly, 550 U.S. 544 (2007), especially 556–57.
• Leegin Creative Leather Products, Inc. v. PSKS, Inc., 551 U.S. 877 (2007), especially 907.
• Monsanto Co. v. Spray-Rite Service Corp., 465 U.S. 752 (1984), especially 763–65.
• FTC: Manufacturer-imposed Requirements.

This guide is general information about legal workflows, not legal advice for any matter. It was drafted and reviewed with AI assistance. The worked example is fictional. Contract rights and procedure depend on the governing law, the actual wording, and the facts, so check the cited sources and the rules that apply in your jurisdiction before relying on it.