Antitrust Radar

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
Observed yearA cell appears only when the current release contains a row for that domain and year.
Original contractUnits, universes, calendar or fiscal periods, status, and source custody stay attached.
Gap disciplineMissing years remain blank and nearest observed years are routes, never substituted values.

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

Cell counts are exact row counts, not metric values or scores.
Exact Yearbook row counts by evidence domain and observation year.
Evidence system
observed rowsBlank means no encoded Yearbook row for that domain-year.1978-2026

Selected-year packet

All evidence observed in 2026

Defined markets

5 exact 2026 rows

Source-reported or reproducibly calculated HHI anchors for separately documented product-market dossiers.
us-ai-assistant-usageAI assistantsMarket HHI4,804HHI points2026 / calendar yearStatCounter Global Statsestimated public / mediumus-browser-usageBrowsersMarket HHI3,612HHI points2026 / calendar yearStatCounter Global Statsestimated public / mediumus-mobile-operating-system-usageMobile operating systemsMarket HHI5,337HHI points2026 / calendar yearStatCounter Global Statsestimated public / mediumus-search-engine-usageSearch enginesMarket HHI7,359HHI points2026 / calendar yearStatCounter Global Statsestimated public / mediumus-social-media-referral-trafficSocial referralsMarket HHI4,995HHI points2026 / calendar yearStatCounter Global Statsestimated public / medium
Market HHI remains definition-dependent. Different product, geography, denominator, and source contracts are not a common national market panel.

Census sectors

No 2026 observation

Strict same-code and same-label sector medians from matched detailed-industry HHI rows in 2017 and 2022.
Gap retainedNo row from this evidence system is encoded for 2026.
Sector medians are NAICS screening summaries, not sector HHI values or legally defined antitrust markets.

Geographic systems

No 2026 observation

National summaries of separately bounded state insurance, statewide deposit, and county deposit-screen systems.
Gap retainedNo row from this evidence system is encoded for 2026.
State and county systems retain different products, boundaries, organizations, years, and permitted screening uses.

Business dynamism

No 2026 observation

Published national Census BDS rates for establishment and job flows from 1978 through 2023.
Gap retainedNo row from this evidence system is encoded for 2026.
BDS rates describe national establishment and employment flows. They are not concentration measures or causal estimates.

Federal merger activity

No 2026 observation

Federal HSR transaction volume and Second Request rates by fiscal year.
Gap retainedNo row from this evidence system is encoded for 2026.
HSR filing volume and review rates describe a federal administrative program, not merger harm, enforcement success, or economy-wide concentration.

Official records

2 exact 2026 rows

Dated complaints, inquiries, decisions, remedies, reports, settlements, and monitoring records.
remedyFTC announces proposed consent agreement with CaremarkRemedy recordsettlementofficial record2026-07-14 / dated recordFederal Trade Commissionverified / highremedyFTC announces proposed consent agreement with Express ScriptsRemedy recordsettlementofficial record2026-02-04 / dated recordFederal Trade Commissionverified / high
A complaint is not a finding, a remedy is not an effect estimate, and record volume is not an enforcement-intensity index.

Public research output

11 2026 briefings

Publication dates describe Antitrust Radar output, not observation vintages.

Selected packet custody

23 linked public sources

Every selected evidence row and publication resolves back to the current source ledger.

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.

  1. 01
    Select the year

    Start with what is encoded for the period rather than assuming every system publishes annually.

  2. 02
    Read within the lane

    Interpret values only against the metric, entity, unit, universe, and period contract shown on the row.

  3. 03
    Open 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.

Read the national briefingThe U.S. Competition Landscape / five evidence systems, no single score
U.S. Competition Yearbook | Antitrust Radar