How HHI Helps Explain Market Concentration
An open explainer on HHI, CR4, effective number of firms, and why source coverage matters.
- Evidence sources
- 3
- Evidence context
- 3 linked markets
Research observatory / publication desk
Prepare a brief from a saved collection of profiles and sources. Documented relationships and original definitions remain attached to the evidence.
Research memo / deterministic evidence synthesis
Executive synthesis
1 of 1 profile pair has at least one direct declared edge; 0 are connected only through a reproducible multi-hop route. The packet carries 1 exact supporting edge and 3 source-custody records: 1 route-bound and 2 profile-linked only without aggregating the profiles into a score.
Canonical scope
An open explainer on HHI, CR4, effective number of firms, and why source coverage matters.
Monthly public StatCounter all-platform browser share export for the United States.
Priority routes
1 exact declared edge: Declared publication source.
Research questionHow should the timing, scope, and competitive significance of the declared Declared publication source between How HHI Helps Explain M... and StatCounter Global Stats be tested with additional observations?
The workspace assembles canonical profiles and declared Atlas edges for research navigation. A direct edge preserves only its encoded evidence statement. A multi-hop route does not establish a direct endpoint relationship, make unlike measures comparable, define a legal market, assign ownership, control, liability, or causation, or prove a policy effect.
Profile-linked custody records document the selected profiles. They do not substantiate a selected pair route unless the same source also appears on a route-bearing edge.
Publication standard
Every audience mode uses the same profiles, paths, edges, and sources. Only the framing of the next question changes.
Name each canonical profile and retain its metric, period, status, and profile route.
Direct, bridged, and disconnected pairs remain explicit throughout the packet.
Carry source custody, edge guardrails, and missing evidence into every export.
Research handoffs
The dossier frames an evidence route. Profiles, the Atlas, source dossiers, and public data remain authoritative.