OECD CompStats / comparative research desk

Competition Enforcement Comparison Studio

Compare reported merger-control activity across OECD jurisdictions in common published years. Counts describe authority activity, not the effectiveness of enforcement or market outcomes.

Open comparison JSON CSV

Jurisdiction universe: 59; economies and regional authorities
Published measures: 8; merger-control activity series
Observation window: 2015-2024; 10 exact annual frames
Comparison limit: 2-4; jurisdictions per shared workspace

Same sourceOne pinned OECD release

Exact yearsNo interpolation or forward filling

Explicit nulls50 unavailable cells

Activity magnitude is not enforcement quality.

Jurisdiction comparison workspace

Compare reported activity without manufacturing a performance score

30 published values across 3 selected jurisdictions and 10 exact years.

Selected jurisdictions

3 / 4

Add jurisdiction

USA

United StatesAmericas

European UnionRegional authority

GBR

United KingdomEurope

Merger-control measureMerger decisions reported by competition authorities.

Trajectory lens

Exact source values on a common zero baseline.

Comparison window

StartEndFocus

Linked comparative reading

2024 selected-jurisdiction evidence note

USA / EU / GBR / Decisions / 2015-2024

01 / Focus-year activity

Published counts span GBR 28 to USA 1,934.

3 of 3 selected jurisdictions report this exact OECD measure in 2024. Count ranks order administrative activity only; they do not rank authority quality, deterrence, or effectiveness.

Reported: 3/3
Selected spread: 1,906
Global rank field: 58

Lowest selected countGBR 28activity rank 42 / 58 Highest selected countUSA 1,934activity rank 1 / 58

02 / Window movement

3 of 3 paths have at least two published frames.

Movement uses each jurisdiction's first and last published values inside 2015-2024. Exact endpoint years remain attached; gaps are not interpolated and count changes are not normalized.

Comparable: 3/3
Increased: 2
Decreased: 1

Largest reported count increase+176 / USA2015 1,758 to 2024 1,934 Largest reported count decrease-46 / GBR2015 74 to 2024 28

03 / Coverage and ratio inputs

3 of 3 selected series are complete across the window.

10 of 10 years are common to every selected path, with 0 missing cells. The separate intervention ratio appears only when all four same-jurisdiction, same-year inputs are published.

Complete series: 3/3
Common years: 10/10
Missing cells: 0

2024 intervention-ratio availability3/3

USA 0.78% to GBR 28.57%. This is a descriptive activity ratio, not an effectiveness measure.

Same-source trajectory

Merger decisions, 2015-2024

Published count / zero baseline

USAUnited StatesEUEuropean UnionGBRUnited Kingdom

Focus-year readout

2024 decisions

Ranks order reported counts across jurisdictions with a published value. They are not performance ranks.

USA

United StatesAmericas

1,934published count

Activity rank: 1 / 58
Intervention ratio: 0.78%
Period change: +10.01%
Coverage: 10 / 10

Open dossier

European UnionEurope

398published count

Activity rank: 5 / 58
Intervention ratio: 1.26%
Period change: +25.16%
Coverage: 10 / 10

Open dossier

GBR

United KingdomEurope

28published count

Activity rank: 42 / 58
Intervention ratio: 28.57%
Period change: -62.16%
Coverage: 10 / 10

Open dossier

Reporting continuity

Published and missing observations

One cell per selected year for decisions.

USA

15161718192021222324

Complete selected window

15161718192021222324

Complete selected window

GBR

15161718192021222324

Complete selected window

Same-year measure matrix

All eight merger-control measures, 2024

Each cell retains its exact source value and within-measure global activity rank.

Measure	USAUnited States	EUEuropean Union	GBRUnited Kingdom
NotificationsMerger notifications reported to competition authorities.	1,973activity rank 1 / 58	392activity rank 5 / 58	39activity rank 41 / 58
DecisionsMerger decisions reported by competition authorities.	1,934activity rank 1 / 58	398activity rank 5 / 58	28activity rank 42 / 58
Phase One clearancesPhase One or single-phase clearances without remedies.	1,914activity rank 1 / 58	390activity rank 5 / 58	18activity rank 46 / 58
Phase One remediesPhase One or single-phase clearances with remedies.	0activity rank 58 / 58	5activity rank 5 / 58	5activity rank 6 / 58
Phase Two clearancesPhase Two clearances after an in-depth investigation without remedies.	5activity rank 4 / 49	3activity rank 7 / 49	2activity rank 12 / 49
Phase Two remediesPhase Two clearances with remedies.	8activity rank 5 / 49	0activity rank 31 / 49	2activity rank 15 / 49
ProhibitionsPhase One or Phase Two prohibitions, challenges, or trials.	7activity rank 2 / 58	0activity rank 38 / 58	1activity rank 9 / 58
WithdrawalsNotifications withdrawn by merging parties.	12activity rank 3 / 58	3activity rank 14 / 58	3activity rank 15 / 58

Exact comparison ledger

Decisions, 2015-2024

Year	USAUnited States	EUEuropean Union	GBRUnited Kingdom
2015	1,758	318	74
2016	1,775	354	72
2017	1,985	375	61
2018	2,023	393	51
2019	2,008	362	49
2020	1,613	351	42
2021	3,403	395	47
2022	3,048	368	40
2023	1,712	332	51
2024	1,934	398	28

Interpretation boundary

A comparison of administrative activity, not a league table.

Notification thresholds, legal mandates, review systems, authority scope, transaction volume, and reporting practices differ across jurisdictions. The studio preserves those limits and supplies descriptive comparisons for research question formation, not judgments about legal correctness, deterrence, welfare, or agency performance.