U.S. economic observatory / evidence by year
U.S. Competition Yearbook
Explore the evidence available for a selected year from 1978 to 2026. Data gaps remain visible, and releases from different periods are not treated as a synchronized panel.
- Calendar span
- 1978-202649 consecutive years
- Evidence rows
- 373kept in source units
- Evidence systems
- 6never combined
- Source ledger
- 31reviewed through Jul 21, 2026
National evidence calendar
2026 U.S. competition profile
7 exact evidence rows / 2 of 6 domains observed- Evidence rows
- 7
- Observed domains
- 2
- Explicit gaps
- 4
- Linked sources
- 23
- Publications
- 11
Observed evidence density
Forty-nine years, six systems, no synchronized panel
| Evidence system | |||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Domain | Period | Entity | Measure or record | Value | Unit | Status | Source |
|---|---|---|---|---|---|---|---|
| Markets | 2026calendar year | us-ai-assistant-usageAI assistants | Market HHIHHI is computed from listed StatCounter percentages, which sum to 100 across tracked assistants. | 4,804 | HHI points | estimated publicmedium | StatCounter Global StatsAI chatbot market share in United States of America May 2026 |
| Markets | 2026calendar year | us-browser-usageBrowsers | Market HHIHHI is computed from listed StatCounter percentages and a residual Other category equal to 100 minus listed shares. | 3,612 | HHI points | estimated publicmedium | StatCounter Global StatsBrowser market share in United States of America, April 2023-April 2026 |
| Markets | 2026calendar year | us-mobile-operating-system-usageMobile operating systems | Market HHIHHI is computed from every category in the pinned StatCounter April mobile operating-system row; source labels and rounding are preserved. | 5,337 | HHI points | estimated publicmedium | StatCounter Global StatsMobile operating system market share in United States of America, April 2023-April 2026 |
| Markets | 2026calendar year | us-search-engine-usageSearch engines | Market HHIHHI is computed from listed StatCounter percentages and a small residual Other category equal to 100 minus listed shares. | 7,359 | HHI points | estimated publicmedium | StatCounter Global StatsSearch engine market share in United States of America, April 2023-April 2026 |
| Markets | 2026calendar year | us-social-media-referral-trafficSocial referrals | Market HHIHHI is computed from every category in the pinned StatCounter April social-media row; the denominator is outbound referral traffic to sampled third-party websites. | 4,995 | HHI points | estimated publicmedium | StatCounter Global StatsSocial media referral share in United States of America, April 2023-April 2026 |
| Records | 2026-07-14dated record | remedyFTC announces proposed consent agreement with Caremark | Remedy recordThe FTC announced a proposed consent agreement with Caremark and Zinc Health Services addressing formulary design, point-of-sale rebates, fee structures, plan-sponsor transparency, community-pharmacy reimbursement, and access to pharmacy hub services. | settlement | official record | verifiedhigh | Federal Trade CommissionFTC Secures Major Settlement with Caremark Resolving Antitrust Case Against Second Drug Middleman |
| Records | 2026-02-04dated record | remedyFTC announces proposed consent agreement with Express Scripts | Remedy recordThe FTC announced a proposed consent agreement with Express Scripts and affiliated entities addressing formulary design, patient cost sharing, manufacturer compensation, plan-sponsor transparency, community-pharmacy reimbursement, and related business practices. | settlement | official record | verifiedhigh | Federal Trade CommissionFTC Secures Landmark Settlement with Express Scripts to Lower Drug Costs for American Patients |
Public research output
11 2026 briefings
Selected packet custody
23 linked public sources
The Yearbook is an evidence calendar, not a synchronized national panel. Every row keeps its own unit, universe, period basis, source, and legal meaning. Missing years remain explicit gaps; values are never forward-filled, normalized onto one scale, added together, or converted into a composite competition score.
Yearbook method
A chronology of evidence, not a chronology of one economy-wide score.
The calendar is useful precisely because its lanes do not line up automatically. It shows where observation density is strong, where the current release is silent, and which public route can answer the next bounded question.
- 01Select the year
Start with what is encoded for the period rather than assuming every system publishes annually.
- 02Read within the lane
Interpret values only against the metric, entity, unit, universe, and period contract shown on the row.
- 03Open the source route
Use the exact profile, source dossier, or public endpoint before drawing a research or policy conclusion.
The Yearbook is an evidence calendar, not a synchronized national panel. Every row keeps its own unit, universe, period basis, source, and legal meaning. Missing years remain explicit gaps; values are never forward-filled, normalized onto one scale, added together, or converted into a composite competition score.
Separate public routes
Inspect the full system behind each calendar lane.
The Yearbook packet is convenient for one selected year. These routes remain the authoritative complete downloads for each underlying evidence system.