{"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. A link or issue grouping does not make unlike measures comparable, establish ownership or control, define an antitrust market, assign liability, or show that a policy event caused an economic outcome.","filters":{"depth":2,"edgeType":"all","edgeTypeMatched":true,"focus":"market:mkt-search","focusMatched":true,"kind":"all","kindMatched":true,"layer":"research","layerMatched":true,"query":"","view":"network"},"summary":{"nodeCount":5478,"edgeCount":19193,"sourceCount":45,"profileCount":5433,"nodeKindCount":13,"layerCount":4,"eligibleEdgeCount":547,"matchedNodeCount":40,"plottedEdgeCount":79,"plottedNodeCount":40,"hiddenNodeCount":0,"directNeighborCount":6},"focusNode":{"id":"market:mkt-search","kind":"market","label":"U.S. search engine usage","shortLabel":"Search engines","description":"All-platform U.S. search engine usage share from StatCounter Global Stats for April 2026. The market is an observed usage-share proxy, not search advertising revenue.","href":"/markets/us-search-engine-usage","metricLabel":"Latest HHI","metricValue":"7,359","detail":"United States / 2026","status":"estimated_public","year":2026,"color":"#14b8a6","searchText":"u.s. search engine usage search engines digital platforms united states all-platform u.s. search engine usage share from statcounter global stats for april 2026. the market is an observed usage-share proxy, not search advertising revenue.","connectionCount":21},"nodes":[{"id":"market:mkt-search","kind":"market","label":"U.S. search engine usage","shortLabel":"Search engines","description":"All-platform U.S. search engine usage share from StatCounter Global Stats for April 2026. The market is an observed usage-share proxy, not search advertising revenue.","href":"/markets/us-search-engine-usage","metricLabel":"Latest HHI","metricValue":"7,359","detail":"United States / 2026","status":"estimated_public","year":2026,"color":"#14b8a6","searchText":"u.s. search engine usage search engines digital platforms united states all-platform u.s. search engine usage share from statcounter global stats for april 2026. the market is an observed usage-share proxy, not search advertising revenue.","connectionCount":21,"distance":0,"labelVisible":true,"radius":20,"x":450,"y":260},{"id":"issue:digital-gateways","kind":"issue","label":"Digital platform gateways","shortLabel":"Digital gateways","description":"How do defaults, distribution agreements, data access, and adjacent-platform positions shape entry across separately measured digital systems?","href":"/issues/digital-platform-gateways","metricLabel":"Bounded markets","metricValue":"5","detail":"5 separately defined markets / editorial research program","status":"issue program","year":2026,"color":"#c026d3","searchText":"digital platform gateways digital gateways defaults, distribution, and adjacent platforms search, browsers, mobile operating systems, social referrals, and generative ai assistants are tracked as separate usage-share proxies while the issue program follows their declared product, operator, and official-record links. how do defaults, distribution agreements, data access, and adjacent-platform positions shape entry across separately measured digital systems? which distribution agreements and default placements affect switching at each gateway? where do data, compute, interoperability, or access conditions constrain entry without assuming the same mechanism across products? which firm-level and user-level records can separate usage movement from changes in product quality, availability, or measurement? u.s. search engine usage search engines digital platforms u.s. browser usage browsers software u.s. generative ai assistant usage ai assistants digital platforms u.s. mobile operating-system web usage mobile operating systems digital platforms u.s. social-media referral traffic social referrals digital platforms","connectionCount":8,"x":450,"y":112,"distance":1,"radius":11,"labelVisible":true},{"id":"report:rep-us-competition-landscape-2026","kind":"report","label":"The U.S. Competition Landscape","shortLabel":"The U.S. Competition La...","description":"A national briefing that aligns defined-market signals, industry structure, state and local geographic concentration screens, merger activity, and enforcement records without collapsing their different scopes.","href":"/reports/us-competition-landscape-2026","metricLabel":"Evidence sources","metricValue":"14","detail":"8 linked markets","status":"published","year":2026,"color":"#6366f1","searchText":"the u.s. competition landscape state of competition 2026: five evidence systems, no single score a national briefing that aligns defined-market signals, industry structure, state and local geographic concentration screens, merger activity, and enforcement records without collapsing their different scopes. a source-backed state-of-competition briefing across markets, industries, state systems, local banking screens, mergers, and enforcement, with every system kept in its own analytical universe. 2022 and 2017 u.s. economic census industry concentration tables, usda ers historical meatpacking cr4, kff 2024 state individual-market hhi, fdic 2025 statewide and county summary of deposits screens, the fy2025 ftc/doj hsr report, and source-backed market and enforcement records.","connectionCount":26,"x":578.172,"y":186,"distance":1,"radius":11,"labelVisible":true},{"id":"report:insight-market-change-field","kind":"report","label":"Latest market-structure signals moved in both directions.","shortLabel":"Market change field","description":"Fifteen HHI, CR4, and leading-share comparisons preserve their own product boundary, denominator, source, and observed interval. The direction count is an inventory, not a vote about competition. HHI points, CR4 points, and leading-share points across different products and periods are not pooled or ranked.","href":"/insights/market-structure-change-field","metricLabel":"Exact signals","metricValue":"15","detail":"AR-CI-2026-01 / Domain readout","status":"current insight","year":2026,"color":"#6366f1","searchText":"latest market-structure signals moved in both directions. market change field fifteen hhi, cr4, and leading-share comparisons preserve their own product boundary, denominator, source, and observed interval. defined markets domain readout ar-ci-2026-01 the current market field is split. across 15 exact latest-to-prior rows, 8 increased, 7 decreased. the count says only how many bounded comparisons point each way. digital usage screens diverged. social referrals moved from 3,804 in 2025 to 4,995 in 2026 (+1,191.0 hhi points). search engines moved from 7,589 in 2025 to 7,359 in 2026 (-230.0 hhi points). mobile operating systems moved from 5,094 in 2025 to 5,337 in 2026 (+243.0 hhi points). browsers moved from 3,720 in 2025 to 3,612 in 2026 (-108.0 hhi points). each usage system has a separate denominator and remains analytically independent. other market intervals use different clocks. beef meatpacking moved from 81.0% in 1995 to 85.0% in 2019 (+4.00 percentage points). fixed broadband moved from 1,195 in 2023 to 1,501 in 2024 (+306.0 hhi points). wireless service moved from 3,596 in 2021 to 3,550 in 2023 (-46.0 hhi points). their unequal intervals are displayed, not annualized. beef meatpacking four-participant concentration ratio browsers four-participant concentration ratio browsers herfindahl-hirschman index browsers leading-participant share fixed broadband herfindahl-hirschman index mobile operating systems four-participant concentration ratio mobile operating systems herfindahl-hirschman index mobile operating systems leading-participant share search engines four-participant concentration ratio search engines herfindahl-hirschman index search engines leading-participant share social referrals four-participant concentration ratio social referrals herfindahl-hirschman index social referrals leading-participant share wireless service herfindahl-hirschman index u.s. steer and heifer purchases by beef packers u.s. browser usage u.s. residential fixed broadband access u.s. mobile operating-system web usage u.s. search engine usage u.s. social-media referral traffic u.s. mobile wireless service","connectionCount":15,"x":578.172,"y":334,"distance":1,"radius":11,"labelVisible":true},{"id":"report:rep-digital-gateways","kind":"report","label":"Five Digital Gateways","shortLabel":"Five Digital Gateways","description":"A source-backed research brief tracing search, browser, mobile operating-system, social-referral, and AI-assistant concentration without collapsing them into one platform market or ecosystem score.","href":"/reports/digital-gateways-brief","metricLabel":"Evidence sources","metricValue":"5","detail":"5 linked markets","status":"published","year":2026,"color":"#6366f1","searchText":"five digital gateways u.s. platform concentration across five separately bounded usage systems a source-backed research brief tracing search, browser, mobile operating-system, social-referral, and ai-assistant concentration without collapsing them into one platform market or ecosystem score. five system histories, exact share rows, official product-attribution paths, and a public research agenda with every denominator kept separate. five statcounter u.s. public usage-share sources: april 2023-april 2026 search, browser, mobile operating-system, and social-referral anchors, plus the may 2026 ai-assistant baseline. official product-attribution records remain a separate evidence layer.","connectionCount":12,"x":450,"y":408,"distance":1,"radius":11,"labelVisible":true},{"id":"report:insight-digital-gateways-change","kind":"report","label":"Four digital usage systems traced four different structural paths.","shortLabel":"Digital gateways","description":"Browser, mobile operating-system, search-engine, and social-referral shares are read side by side without turning them into one platform-power score. Usage and referral shares are proxies inside separately defined systems. The dispatch does not add shares across products, resolve legal market definition, or infer a common competitive cause.","href":"/insights/digital-gateways-change","metricLabel":"Exact signals","metricValue":"12","detail":"AR-CI-2026-02 / Focused note","status":"current insight","year":2026,"color":"#6366f1","searchText":"four digital usage systems traced four different structural paths. digital gateways browser, mobile operating-system, search-engine, and social-referral shares are read side by side without turning them into one platform-power score. defined markets focused note ar-ci-2026-02 social-referral composition shifted toward the leader. social referrals moved from 3,804 in 2025 to 4,995 in 2026 (+1,191.0 hhi points). social referrals moved from 57.5% in 2025 to 68.9% in 2026 (+11.49 percentage points). social referrals moved from 95.1% in 2025 to 94.4% in 2026 (-0.71 percentage points). search hhi and leading share both moved lower. search engines moved from 7,589 in 2025 to 7,359 in 2026 (-230.0 hhi points). search engines moved from 86.7% in 2025 to 85.2% in 2026 (-1.55 percentage points). search engines moved from 99.4% in 2025 to 99.4% in 2026 (-0.02 percentage points). mobile operating-system hhi and leading share moved higher. mobile operating systems moved from 5,094 in 2025 to 5,337 in 2026 (+243.0 hhi points). mobile operating systems moved from 57.6% in 2025 to 63.1% in 2026 (+5.48 percentage points). mobile operating systems moved from 100.0% in 2025 to 100.0% in 2026 (+0.04 percentage points). browser hhi and leading share moved lower while cr4 edged higher. browsers moved from 3,720 in 2025 to 3,612 in 2026 (-108.0 hhi points). browsers moved from 52.3% in 2025 to 50.0% in 2026 (-2.29 percentage points). browsers moved from 93.6% in 2025 to 93.8% in 2026 (+0.15 percentage points). browsers four-participant concentration ratio browsers herfindahl-hirschman index browsers leading-participant share mobile operating systems four-participant concentration ratio mobile operating systems herfindahl-hirschman index mobile operating systems leading-participant share search engines four-participant concentration ratio search engines herfindahl-hirschman index search engines leading-participant share social referrals four-participant concentration ratio social referrals herfindahl-hirschman index social referrals leading-participant share u.s. browser usage u.s. mobile operating-system web usage u.s. search engine usage u.s. social-media referral traffic","connectionCount":10,"x":321.828,"y":334,"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":321.828,"y":186,"distance":1,"radius":11,"labelVisible":true},{"id":"market:mkt-browser","kind":"market","label":"U.S. browser usage","shortLabel":"Browsers","description":"All-platform U.S. browser usage share from StatCounter Global Stats for April 2026. The profile tracks browser usage concentration, not browser advertising or operating-system tying questions.","href":"/markets/us-browser-usage","metricLabel":"Latest HHI","metricValue":"3,612","detail":"United States / 2026","status":"estimated_public","year":2026,"color":"#14b8a6","searchText":"u.s. browser usage browsers software united states all-platform u.s. browser usage share from statcounter global stats for april 2026. the profile tracks browser usage concentration, not browser advertising or operating-system tying questions.","connectionCount":21,"x":468.874,"y":50.85,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-airlines","kind":"market","label":"U.S. domestic airline passengers","shortLabel":"Domestic airlines","description":"Domestic scheduled airline passenger market share based on BTS TranStats for the 12 months ending February 2026. The profile withholds HHI because the public table includes an aggregated Other category.","href":"/markets/us-airline-domestic-passengers","metricLabel":"HHI status","metricValue":"Withheld","detail":"United States / 2026","status":"incomplete","year":2026,"color":"#14b8a6","searchText":"u.s. domestic airline passengers domestic airlines transportation united states domestic scheduled airline passenger market share based on bts transtats for the 12 months ending february 2026. the profile withholds hhi because the public table includes an aggregated other category.","connectionCount":21,"x":527.034,"y":64.64,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-social-referral","kind":"market","label":"U.S. social-media referral traffic","shortLabel":"Social referrals","description":"Social-platform concentration based on U.S. page views referred from social-media sites to StatCounter-tracked websites in April 2023-April 2026. The series measures outbound referral traffic, not platform users, time spent, advertising revenue, engagement, or an antitrust market.","href":"/markets/us-social-media-referral-traffic","metricLabel":"Latest HHI","metricValue":"4,995","detail":"United States / 2026","status":"estimated_public","year":2026,"color":"#14b8a6","searchText":"u.s. social-media referral traffic social referrals digital platforms united states social-platform concentration based on u.s. page views referred from social-media sites to statcounter-tracked websites in april 2023-april 2026. the series measures outbound referral traffic, not platform users, time spent, advertising revenue, engagement, or an antitrust market.","connectionCount":21,"x":578.953,"y":94.256,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-mobile-os","kind":"market","label":"U.S. mobile operating-system web usage","shortLabel":"Mobile operating systems","description":"Mobile operating-system concentration based on the operating systems detected in U.S. mobile page views measured by StatCounter in April 2023-April 2026. The series is a public web-usage proxy rather than device sales, installed base, app-store activity, or operating-system revenue.","href":"/markets/us-mobile-operating-system-usage","metricLabel":"Latest HHI","metricValue":"5,337","detail":"United States / 2026","status":"estimated_public","year":2026,"color":"#14b8a6","searchText":"u.s. mobile operating-system web usage mobile operating systems digital platforms united states mobile operating-system concentration based on the operating systems detected in u.s. mobile page views measured by statcounter in april 2023-april 2026. the series is a public web-usage proxy rather than device sales, installed base, app-store activity, or operating-system revenue.","connectionCount":18,"x":620.425,"y":137.3,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-ai-chatbot","kind":"market","label":"U.S. generative AI assistant usage","shortLabel":"AI assistants","description":"Consumer generative AI assistant usage concentration from StatCounter Global Stats for May 2026. The market tracks which AI chatbots people use across StatCounter-tracked assistants, an observed usage-share proxy rather than revenue, total user counts, or the broader AI supply chain of chips and cloud.","href":"/markets/us-ai-assistant-usage","metricLabel":"Latest HHI","metricValue":"4,804","detail":"United States / 2026","status":"estimated_public","year":2026,"color":"#14b8a6","searchText":"u.s. generative ai assistant usage ai assistants digital platforms united states consumer generative ai assistant usage concentration from statcounter global stats for may 2026. the market tracks which ai chatbots people use across statcounter-tracked assistants, an observed usage-share proxy rather than revenue, total user counts, or the broader ai supply chain of chips and cloud.","connectionCount":16,"x":648.09,"y":190.285,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-housing","kind":"market","label":"U.S. rental housing access","shortLabel":"Rental housing","description":"Rental housing access profile combining national affordability and supply stress with selected public evidence on institutional single-family rental ownership. HHI is withheld because housing competition is local and the public record does not provide firm-level rental market shares across comparable local markets.","href":"/markets/us-rental-housing-access","metricLabel":"HHI status","metricValue":"Withheld","detail":"United States / local housing markets / 2026","status":"incomplete","year":2026,"color":"#14b8a6","searchText":"u.s. rental housing access rental housing real estate united states / local housing markets rental housing access profile combining national affordability and supply stress with selected public evidence on institutional single-family rental ownership. hhi is withheld because housing competition is local and the public record does not provide firm-level rental market shares across comparable local markets.","connectionCount":11,"x":659.707,"y":248.917,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-wireless","kind":"market","label":"U.S. mobile wireless service","shortLabel":"Wireless service","description":"Mobile wireless service competition using FCC-reported weighted average HHI by economic area. Firm-level shares are not shown because the FCC report publishes the concentration metric rather than a full public carrier share table.","href":"/markets/us-mobile-wireless-service","metricLabel":"Latest HHI","metricValue":"3,550","detail":"United States / 2023","status":"verified","year":2023,"color":"#14b8a6","searchText":"u.s. mobile wireless service wireless service telecommunications united states mobile wireless service competition using fcc-reported weighted average hhi by economic area. firm-level shares are not shown because the fcc report publishes the concentration metric rather than a full public carrier share table.","connectionCount":10,"x":654.335,"y":308.448,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-pbm","kind":"market","label":"U.S. pharmacy benefit management","shortLabel":"PBMs","description":"Pharmacy benefit management services profile based on FTC public findings. The FTC reports top-three and top-six aggregate shares but not enough individual PBM market shares in the public press-release record to compute HHI.","href":"/markets/us-pharmacy-benefit-management","metricLabel":"HHI status","metricValue":"Withheld","detail":"United States / 2023","status":"incomplete","year":2023,"color":"#14b8a6","searchText":"u.s. pharmacy benefit management pbms health care united states pharmacy benefit management services profile based on ftc public findings. the ftc reports top-three and top-six aggregate shares but not enough individual pbm market shares in the public press-release record to compute hhi.","connectionCount":10,"x":632.409,"y":364.053,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-meatpacking","kind":"market","label":"U.S. steer and heifer purchases by beef packers","shortLabel":"Beef meatpacking","description":"Buyer-side meatpacking concentration using USDA-reported shares of U.S. steer and heifer purchases handled by the four largest beef packers. The profile preserves the national CR4 history but withholds HHI because the public source does not publish individual packer shares.","href":"/markets/us-steer-heifer-meatpacking-purchases","metricLabel":"HHI status","metricValue":"Withheld","detail":"United States / regional cattle procurement markets / 2019","status":"incomplete","year":2019,"color":"#14b8a6","searchText":"u.s. steer and heifer purchases by beef packers beef meatpacking food and agriculture united states / regional cattle procurement markets buyer-side meatpacking concentration using usda-reported shares of u.s. steer and heifer purchases handled by the four largest beef packers. the profile preserves the national cr4 history but withholds hhi because the public source does not publish individual packer shares.","connectionCount":9,"x":595.705,"y":411.229,"distance":2,"radius":8,"labelVisible":false},{"id":"market:mkt-fixed-broadband","kind":"market","label":"U.S. residential fixed broadband access","shortLabel":"Fixed broadband","description":"Residential fixed-internet competition using FCC-reported HHI for connections of at least 100 Mbps downstream and 20 Mbps upstream. The profile publishes annual December national anchors and links to the same-source state, county, and census-tract median series without treating those geographic summaries as one market.","href":"/markets/us-fixed-broadband-access","metricLabel":"Latest HHI","metricValue":"1,501","detail":"United States / separately reported state, county, and census-tract summaries / 2024","status":"verified","year":2024,"color":"#14b8a6","searchText":"u.s. residential fixed broadband access fixed broadband telecommunications united states / separately reported state, county, and census-tract summaries residential fixed-internet competition using fcc-reported hhi for connections of at least 100 mbps downstream and 20 mbps upstream. the profile publishes annual december national anchors and links to the same-source state, county, and census-tract median series without treating those geographic summaries as one market.","connectionCount":7,"x":547.197,"y":446.153,"distance":2,"radius":8,"labelVisible":false},{"id":"topic:market-structure","kind":"topic","label":"Market Structure","shortLabel":"Market Structure","description":"Where is market power concentrated, how is structure changing, and which competitive mechanism still needs to be tested?","href":"/research/topics/market-structure","metricLabel":"Publication memberships","metricValue":"9","detail":"AR-T01 / 6 issue programs / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t01 market structure markets where is market power concentrated, how is structure changing, and which competitive mechanism still needs to be tested? 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":490.814,"y":465.996,"distance":2,"radius":8,"labelVisible":false},{"id":"topic:industry-structure","kind":"topic","label":"Industry Structure","shortLabel":"Industry Structure","description":"Which detailed industries account for broad-sector concentration patterns, and where does strict historical evidence show structural movement?","href":"/research/topics/industry-structure","metricLabel":"Publication memberships","metricValue":"4","detail":"AR-T03 / 1 issue program / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t03 industry structure industries which detailed industries account for broad-sector concentration patterns, and where does strict historical evidence show structural movement? keep census industry distributions, strict same-code history, business flows, and reviewed market context inspectable at their published levels. a naics industry is a statistical classification, not automatically an antitrust market. sector medians, revenue concentration, and business dynamics retain different units and vintages. strict six-digit histories, disclosure status, firm and establishment context, product and geographic boundaries, entry, conduct, prices, quality, and enforcement records. industrial-organization researchers, sector analysts, and public agencies ar-sc-2026-01 the u.s. competition landscape ar-rb-2026-01 beef meatpacking buyer power ar-rb-2026-04 business dynamism across u.s. sectors, 1978-2023 ar-ci-2026-03 broad-sector concentration medians did not move as one economy.","connectionCount":22,"x":431.126,"y":469.15,"distance":2,"radius":8,"labelVisible":false},{"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? connect place-based concentration screens to their exact geography, source vintage, ownership rules, and local-market research needs. a statewide, county, tract, or national screen does not establish a legal geographic market. medians of local hhis are not interchangeable with one national hhi. area-level shares and distributions, ownership and entry histories, local prices and quality, commuting or procurement patterns, capacity, switching, and stable geographic definitions. local officials, researchers, journalists, and community advocates ar-sc-2026-01 the u.s. competition landscape ar-dn-2026-02 housing competition needs local ownership data 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-2026-04 geographic concentration screens point in different directions at different scales. ar-ci-2026-05 national fixed-broadband hhi rose while three geographic medians fell.","connectionCount":17,"x":372.966,"y":455.36,"distance":2,"radius":8,"labelVisible":false},{"id":"topic:digital-platforms","kind":"topic","label":"Digital Platforms","shortLabel":"Digital Platforms","description":"How do defaults, distribution, data access, interoperability, and adjacent-platform positions shape entry across separately measured digital systems?","href":"/research/topics/digital-platforms","metricLabel":"Publication memberships","metricValue":"2","detail":"AR-T02 / 1 issue program / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t02 digital platforms digital how do defaults, distribution, data access, interoperability, and adjacent-platform positions shape entry across separately measured digital systems? trace usage and referral screens into exact product, operator, official-record, and research links while keeping every digital denominator separate. search, browser, mobile operating system, social referral, and ai-assistant usage are separate screens. their adjacency does not establish one ecosystem market, common control, or a combined concentration measure. stable user and firm panels, default and distribution contracts, switching, multihoming, interoperability, data access, compute, price, quality, and entry records. technology-policy researchers, reporters, authorities, and advocates ar-rb-2026-02 five digital gateways ar-ci-2026-02 four digital usage systems traced four different structural paths.","connectionCount":15,"x":321.047,"y":425.744,"distance":2,"radius":8,"labelVisible":false},{"id":"topic:merger-review","kind":"topic","label":"Merger Review","shortLabel":"Merger Review","description":"How are notification volume, transaction mix, review intensity, official outcomes, and observed market structure changing without conflating process with effect?","href":"/research/topics/merger-review","metricLabel":"Publication memberships","metricValue":"3","detail":"AR-T06 / 2 issue programs / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t06 merger review mergers how are notification volume, transaction mix, review intensity, official outcomes, and observed market structure changing without conflating process with effect? keep federal filing, transaction-size, review-process, structural-screen, and official-record evidence in separate but connected lanes. notification counts, second request rates, concentration screens, complaints, settlements, and abandonments have different denominators and meanings. none alone establishes transaction effects or legal merit. transaction-level industry and size, thresholds, exemptions, agency allocation, review timing, outcomes, remedies, market shares, entry, price, quality, and capacity. merger researchers, oversight staff, journalists, and enforcement practitioners ar-sc-2026-01 the u.s. competition landscape ar-rb-2026-05 the federal merger review pipeline, 2016-2025 ar-ci-2026-07 reported hsr volume and the second request rate both moved lower in fy2025.","connectionCount":7,"x":279.575,"y":382.7,"distance":2,"radius":8,"labelVisible":false},{"id":"topic:methods-public-data","kind":"topic","label":"Methods and Public Data","shortLabel":"Methods and Public Data","description":"What can current public records establish, where do measurement boundaries stop, and which disclosures would make antitrust research more accountable?","href":"/research/topics/methods-public-data","metricLabel":"Publication memberships","metricValue":"3","detail":"AR-T07 / 2 issue programs / 5 evidence lanes","status":"institutional research topic","year":2026,"color":"#ea580c","searchText":"ar-t07 methods and public data methods what can current 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