{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"atlas","updatedThrough":"2026-08-15","guardrail":"The atlas exposes only relationships declared in the current public data. 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connect definition-bound concentration measures, participant shares, historical movement, and public research questions without collapsing unlike markets into one score. a concentration measure is a screen inside its stated product, geography, denominator, and period. it is not by itself proof of market power, harm, causation, liability, or the correct legal market. comparable participant shares, entry and exit, switching, price, quality, capacity, transactions, and stable market-definition records. researchers, journalists, enforcement staff, and public officials ar-sc-2026-01 the u.s. competition landscape ar-mm-2026-01 how hhi helps explain market concentration ar-rb-2026-02 five digital gateways ar-rb-2026-01 beef meatpacking buyer power ar-rb-2026-03 state banking structure, 2015-2025 ar-rb-2026-06 fixed broadband concentration across geographic scales, 2020-2024 ar-rb-2026-07 state individual insurance concentration, 2024 ar-ci-2026-01 latest market-structure signals moved in both directions. ar-ci-2026-02 four digital usage systems traced four different structural paths.","connectionCount":30,"x":598,"y":260,"distance":1,"radius":11,"labelVisible":true},{"id":"topic:geographic-competition","kind":"topic","label":"Geographic Competition","shortLabel":"Geographic Competition","description":"How does competitive structure vary across national, state, county, tract, route, and other local frames?","href":"/research/topics/geographic-competition","metricLabel":"Publication memberships","metricValue":"7","detail":"AR-T04 / 4 issue programs / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t04 geographic competition places how does competitive structure vary across national, state, county, tract, route, and other local frames? 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document definitions, denominators, source construction, release clocks, reproducibility paths, and evidence gaps as first-class research outputs. a documented data gap is not evidence of competition or harm. screening thresholds are not legal conclusions, and reproducibility does not make unlike measures comparable. stable identifiers, machine-readable firm shares and ownership, local boundaries, historical revisions, disclosure status, methods documentation, and durable public apis. data publishers, analysts, students, reporters, agencies, and legislators ar-mm-2026-01 how hhi helps explain market concentration ar-dn-2026-01 where public market-share data runs out ar-dn-2026-02 housing competition needs local ownership data","connectionCount":5,"x":302,"y":260,"distance":1,"radius":11,"labelVisible":true}],"rows":[{"id":"issue-scope:housing-access:mkt-housing","layer":"research","relationshipType":"issue_scope","relationshipLabel":"Issue program membership","fromId":"issue:housing-access","fromKind":"issue","fromLabel":"Housing access and local power","fromHref":"/issues/housing-access-and-local-power","toId":"market:mkt-housing","toKind":"market","toLabel":"U.S. rental housing access","toHref":"/markets/us-rental-housing-access","evidenceLabel":"Competition issue scope contract","evidenceDetail":"U.S. rental housing access is an explicitly curated member of the Housing access and local power research program while retaining its own product boundary, geography, denominator, and comparison contract.","sourceId":null,"sourceUrl":null,"confidenceLevel":"bounded","indicatorId":null,"entityCode":null,"observationCount":null,"firstYear":null,"latestYear":null,"preferredView":null,"sourceIds":null,"guardrail":"An editorial issue membership supports research navigation only; it does not combine the member markets, define a broader antitrust market, or establish competitive harm or causation."},{"id":"topic-issue:geographic-competition:housing-access","layer":"research","relationshipType":"topic_issue","relationshipLabel":"Declared issue-program membership","fromId":"topic:geographic-competition","fromKind":"topic","fromLabel":"Geographic Competition","fromHref":"/research/topics/geographic-competition","toId":"issue:housing-access","toKind":"issue","toLabel":"Housing access and local power","toHref":"/issues/housing-access-and-local-power","evidenceLabel":"Research topic issue contract","evidenceDetail":"Housing access and local power is explicitly included in the Geographic Competition institutional research contract.","sourceId":null,"sourceUrl":null,"confidenceLevel":"bounded","indicatorId":null,"entityCode":null,"observationCount":null,"firstYear":null,"latestYear":null,"preferredView":null,"sourceIds":null,"guardrail":"A topic-to-issue link records one declared institutional membership. 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