Antitrust Radar
Construction two-anchor observed comparison2017 13.3 to 2022 19.4, a increase of +6.1. The vertical placement is normalized to this two-point comparison and is not a shared scale.PRIOR ANCHORLATEST ANCHOR

Canonical research dossier

Q16 / Census industries / Industry disaggregation

Which six-digit industries drive the sector shift, and where do product, geography, entry, conduct, price, quality, or enforcement records justify deeper market-level research?

Construction / Median detailed-industry HHI
2017
13.3
prior anchor
Observed change
+6.1
5 years
2022
19.4
latest anchor
Current custody
2
source records
Observed comparisonExact values, periods, metric, unit, and universe stay attached.
Research questionThe monitor question is preserved verbatim as a bounded program of inquiry.
Evidence to collectDeclared requests are future work, not established evidence or findings.
Evidence standard

Published signal

The observation behind the question

Difference between the 2017 and 2022 medians for the same strict six-digit matched universe; this is not the median of row-level changes.
201713.3prior
+6.1Increase
202219.4latest
Observed signalConstruction moved from a paired-universe median HHI of 13.3 in 2017 to 19.4 in 2022 (+6.1 HHI points).

The 2022 median is higher than the 2017 median across the same published strict-match screen. Sector medians are orientation statistics, not sector HHI values or legal market findings.

Sector rows summarize strict six-digit NAICS matches. Their medians are not sector HHI values, legal antitrust markets, liability findings, or causal estimates. Vintage medians and the median of row-level changes are distinct distribution statistics and need not reconcile. Publication coverage varies by metric, and revenue changes are nominal.

Declared empirical track

Industry disaggregation

Trace a sector median back to strict six-digit Census rows before proposing a product or geographic market study.
Evidence base
24/31 strict six-digit pairs / 77.4% coverage
Data status
verified
Confidence
high
Metric family
industry-median-hhi

Evidence to collect

4 declared requests
  1. 01

    Strict-match six-digit rows contributing to the 2017 and 2022 sector medians.

  2. 02

    Classification, disclosure, and publication-status checks for rows outside the paired universe.

  3. 03

    Revenue, employment, firm-count, and establishment context for the largest row movements.

  4. 04

    Product, geography, entry, conduct, price, quality, and enforcement records for candidate market studies.

These requests define collection work. Their inclusion does not assert that the records exist, support a claim, or establish a cause.

Current source custody

Evidence already attached to the observed signal

Collection requests above remain separate from these published source records.
U.S. Census Bureau2017 Economic Census Concentration of Largest FirmsSource profileU.S. Census Bureau2022 Economic Census Concentration of Largest FirmsSource profile

Sector rows summarize strict six-digit NAICS matches. Their medians are not sector HHI values, legal antitrust markets, liability findings, or causal estimates. Vintage medians and the median of row-level changes are distinct distribution statistics and need not reconcile. Publication coverage varies by metric, and revenue changes are nominal.

Research handoffs

Keep the question connected to its evidence system

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