{"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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which comparable state insurer enrollment, claims, prescription, rebate, and network records can establish firm-level structure under stable ownership identifiers? how do plan entry, insurer structure, contracting, formulary, and network practices differ across payer, pharmacy, patient, and geographic segments? which ownership and control relationships are supported by exact filings rather than name similarity or market context? u.s. pharmacy benefit management pbms health care u.s. aca individual health insurance individual insurance health insurance","connectionCount":4,"x":450,"y":112,"distance":1,"radius":11,"labelVisible":true},{"id":"issue:housing-access","kind":"issue","label":"Housing access and local power","shortLabel":"Housing access","description":"Which local ownership, pricing, supply, and platform records can identify where renters face weakened competitive choice?","href":"/issues/housing-access-and-local-power","metricLabel":"Bounded markets","metricValue":"1","detail":"1 separately defined market / editorial research program","status":"issue program","year":2026,"color":"#c026d3","searchText":"housing access and local power housing access ownership, pricing systems, supply, and place the program joins national housing-access evidence to selected ownership and official-record context while keeping the underlying competition problem local. which local ownership, pricing, supply, and platform records can identify where renters face weakened competitive choice? where can parcel, owner, property-manager, rent, vacancy, and transaction data be joined at a stable local geography? how should pricing-software use, information exchange, ownership concentration, and supply constraints be measured separately? which local comparisons can test entry, rent, quality, and displacement outcomes without treating co-movement as causation? u.s. rental housing access rental housing real estate","connectionCount":4,"x":590.756,"y":214.265,"distance":1,"radius":11,"labelVisible":true},{"id":"report:rep-hhi-primer","kind":"report","label":"How HHI Helps Explain Market Concentration","shortLabel":"How HHI Helps Explain M...","description":"An open explainer on HHI, CR4, effective number of firms, and why source coverage matters.","href":"/reports/hhi-primer","metricLabel":"Evidence sources","metricValue":"3","detail":"3 linked markets","status":"published","year":2026,"color":"#6366f1","searchText":"how hhi helps explain market concentration a public primer for reading concentration dashboards an open explainer on hhi, cr4, effective number of firms, and why source coverage matters. a short public-interest guide to reading descriptive concentration metrics. fcc source-reported hhi and statcounter public usage-share tables.","connectionCount":8,"x":536.992,"y":379.735,"distance":1,"radius":11,"labelVisible":true},{"id":"report:rep-housing-data-gap","kind":"report","label":"Housing Competition Needs Local Ownership Data","shortLabel":"Housing Competition Nee...","description":"An open brief explaining why housing affordability and supply stress require local competition data before HHI can be responsibly reported.","href":"/reports/housing-competition-data-gap","metricLabel":"Evidence sources","metricValue":"4","detail":"1 linked market","status":"published","year":2026,"color":"#6366f1","searchText":"housing competition needs local ownership data source-backed housing profile note an open brief explaining why housing affordability and supply stress require local competition data before hhi can be responsibly reported. explains why the housing profile reports public stress signals while withholding hhi pending local firm-level ownership and rental market-share data. harvard jchs renter cost-burden data, freddie mac supply-shortage estimate, gao selected single-family rental investor ownership data, and ftc/doj roll-up inquiry materials.","connectionCount":7,"x":363.008,"y":379.735,"distance":1,"radius":11,"labelVisible":true},{"id":"report:rep-public-data-gaps","kind":"report","label":"Where Public Market-Share Data Runs Out","shortLabel":"Where Public Market-Sha...","description":"An open report explaining why the observatory sometimes withholds HHI even when public facts indicate concentration.","href":"/reports/public-data-gaps","metricLabel":"Evidence sources","metricValue":"2","detail":"2 linked markets","status":"published","year":2026,"color":"#6366f1","searchText":"where public market-share data runs out why incomplete profiles are part of the product an open report explaining why the observatory sometimes withholds hhi even when public facts indicate concentration. a transparency note on incomplete data and why the observatory never fills gaps with invented shares. bts public airline market-share table and ftc pbm interim staff report materials.","connectionCount":5,"x":309.244,"y":214.265,"distance":1,"radius":11,"labelVisible":true}],"rows":[{"id":"topic-issue:methods-public-data:health-care-intermediaries","layer":"research","relationshipType":"topic_issue","relationshipLabel":"Declared issue-program membership","fromId":"topic:methods-public-data","fromKind":"topic","fromLabel":"Methods and Public Data","fromHref":"/research/topics/methods-public-data","toId":"issue:health-care-intermediaries","toKind":"issue","toLabel":"Health care intermediaries","toHref":"/issues/health-care-intermediaries","evidenceLabel":"Research topic issue contract","evidenceDetail":"Health care intermediaries is explicitly included in the Methods and Public Data 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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