Claim LD03-SL-C18 (v1.0)
Brynjolfsson, Rock and Syverson model how general-purpose technologies such as AI need large, poorly measured intangible investments, so measured productivity growth is first understated and later overstated (a 'productivity J-curve'); adjusting for intangibles tied to computers put US total factor productivity 15.9% above official measures by the end of 2017.
Research opportunities this claim motivates
What this claim leaves open for research. Each is a hypothesis about a gap, not a finding.
- Is there a generative-AI productivity J-curve inside firms?The productivity J-curve: general-purpose technologies need large, poorly measured intangible investment, so measured productivity is first understated and later overstated.
Provenance and status
- Claim type
- INTERPRETATION (as printed: “INTERPRETATION”)
- Publication status
- ELIGIBLE (QUALIFIED) (as printed: “ELIGIBLE WITH QUALIFIER”)
- Verification state
- CONTENT_VERIFIED_PRIMARY (ABSTRACT_ONLY) (as printed: “CONTENT VERIFIED ABSTRACT”; verified by: UNKNOWN)
- Does not license
- Any estimate for generative AI; a prediction of when gains will appear
- Source (field 6, as printed)
- Brynjolfsson, Rock & Syverson, “The Productivity J-Curve: How Intangibles Complement General Purpose Technologies,” American Economic Journal: Macroeconomics 13(1), 2021
- Source type (field 7)
- PEER_REVIEWED_JOURNAL_ARTICLE (as printed: “Peer-reviewed journal article”)
- Institutional position
- Independent academic
- Maturity (claim evidence / publication maturity)
- MATURE (as printed: “MATURE”)
- Recorded date
- 2026-10-15
- Currentness / correction
- This is the current version. No correction or concern relation is recorded on its Sources.
Version
Current version v1.0, resolved through the explicit current pointer CLAIM--LD03-SL-C18.
Pinned Sources (field 6, version-specific)
- “Brynjolfsson, Rock & Syverson, “The Productivity J-Curve: How Intangibles Complement General Purpose Technologies,” American Economic Journal: Macroeconomics 13(1), 2021” → SRC-SL-BRYNJOLFSSON-ROCK-SYVERSON-AEJ-MACRO-2021--v1.0 — Brynjolfsson, Rock & Syverson, “The Productivity J-Curve: How Intangibles Complement General Purpose Technologies,” American Economic Journal: Macroeconomics 13(1), 2021; class PEER_REVIEWED_JOURNAL_ARTICLE (explicit public provenance pin)
All 25 canonical Claim fields (raw values and normalized values)
| # | Canonical field | Canonical value (verbatim) | Normalized (Claim Value Vocabulary v1.0.2) |
|---|---|---|---|
| 1 | CLAIM ID | LD03-SL-C18 | — |
| 2 | PUBLIC-FACING CLAIM | Brynjolfsson, Rock and Syverson model how general-purpose technologies such as AI need large, poorly measured intangible investments, so measured productivity growth is first understated and later overstated (a 'productivity J-curve'); adjusting for intangibles tied to computers put US total factor productivity 15.9% above official measures by the end of 2017. | — |
| 3 | CLAIM TYPE | INTERPRETATION | base_types: INTERPRETATION |
| 4 | RESEARCH STRAND | D — Aggregate estimates and theory | — |
| 5 | MATURITY | MATURE | states: MATURE |
| 6 | SOURCE | Brynjolfsson, Rock & Syverson, “The Productivity J-Curve: How Intangibles Complement General Purpose Technologies,” American Economic Journal: Macroeconomics 13(1), 2021 | source_ids: SRC-SL-BRYNJOLFSSON-ROCK-SYVERSON-AEJ-MACRO-2021 |
| 7 | SOURCE TYPE | Peer-reviewed journal article | classes: PEER_REVIEWED_JOURNAL_ARTICLE |
| 8 | INSTITUTIONAL POSITION | Independent academic | — |
| 9 | SCOPE | US economy; computer hardware and software to 2017 | — |
| 10 | DESIGN | Model plus measurement adjustment of national accounts | — |
| 11 | SAMPLE / DATASET | US national accounts | — |
| 12 | MODEL / TOOL / VERSION | Computer hardware and software (pre-generative AI) | — |
| 13 | COMPARATOR | Official TFP measures | — |
| 14 | MAIN RESULT | Measured productivity understated early and overstated later; TFP level 15.9% above official measures at end-2017 after adjusting for intangibles | — |
| 15 | INFERENTIAL TARGET | Why a general-purpose technology's gains appear late in measured productivity | — |
| 16 | DOES NOT LICENSE | Any estimate for generative AI; a prediction of when gains will appear | — |
| 17 | VERIFICATION STATE | CONTENT VERIFIED ABSTRACT | state: CONTENT_VERIFIED_PRIMARY · qualifiers: ABSTRACT_ONLY · verified_by: UNKNOWN |
| 18 | LIMITATIONS | Checked against the official abstract only, read in the Crossref record on 15 October 2026; the measurement concerns computers, not generative AI | — |
| 19 | CONTRADICTORY / SUPPORTING SOURCES | The theoretical basis of the absorption-lag position; contrasts with models of a low ceiling | — |
| 20 | GEOGRAPHY / LANGUAGE | US / English | — |
| 21 | DISTRIBUTIONAL LEDGER | Not analysed in this claim | — |
| 22 | R01 / FIELD-MAP LINKS | LD-03, D2 | — |
| 23 | WHAT WOULD CHANGE THIS CLAIM? | Measured intangible investment in generative AI showing no lag pattern | — |
| 24 | PUBLICATION STATUS | ELIGIBLE WITH QUALIFIER | state: ELIGIBLE · qualifiers: QUALIFIED |
| 25 | RECORDED DATE | 2026-10-15 | — |
Field 22 references resolved against Field Map v0.2: LD-03 (LIVING_DEBATE); D2 (DOMAIN)
Cited by Living Debate versions
Research-of-record provenance
Materialized by sociolens-materializer 0.6.0 at 2026-09-28T20:00:00.000Z; normalization contract SocioLens — Claim Value Vocabulary v1.0.2 — Pre-Spike Materialization Contract (v1.0.2). Content seal SHA-256 fdf4877ab8c8a262883c8b59cf0d1401657ed418ffa9b8ce0450f74d7da38000.
Repository-authored inputs (not Drive exports)
- SocioLens claim — LD03-SL-C18 v1.0 (v1.0) — written in the SocioLens repository by Project Lead (Claude, AI) on 2026-10-15; no Drive identity exists. Authority: AGENTS.md "Authority" (the Project Lead decides research content within the research-integrity rules) and the Owner's choice in the SocioLens project chat on 15 October 2026 to build the LD-03 debate; a new Claim, first version, written from the project's LD-03 source notes, checked against full texts or official abstracts. Block “ENTRY 18 — LD03-SL-C18” SHA-256
2919ebf11a4de9172e3419a65c92a231d8a53cb4b2d6f2c9608199ffdc2ab836; fixturefixtures/authored/claims/LD03-SL-C18--v1.0.
Builder decisions (not Drive data)
- VERSION = v1.0 — basis: Claim version taken from the repository-authored claim fixture version (SocioLens claim — LD03-SL-C18 v1.0); the first version of a new Claim of the LD-03 debate
- CURRENT_POINTER = true — basis: repository-authored claim "SocioLens claim — LD03-SL-C18 v1.0" (Project Lead (Claude, AI), 2026-10-15); basis: AGENTS.md "Authority" (the Project Lead decides research content within the research-integrity rules) and the Owner's choice in the SocioLens project chat on 15 October 2026 to build the LD-03 debate; a new Claim, first version, written from the project's LD-03 source notes, checked against full texts or official abstracts
- FIELD_6_SOURCE_REFERENCE = SRC-SL-BRYNJOLFSSON-ROCK-SYVERSON-AEJ-MACRO-2021--v1.0 — basis: field 6 of ENTRY 18 — LD03-SL-C18 cites "Brynjolfsson, Rock & Syverson, “The Productivity J-Curve: How Intangibles Complement General Purpose Technologies,” American Economic Journal: Macroeconomics 13(1), 2021"; the only field-6 segment of this ClaimVersion's repository-authored ledger block.
- SOURCE_PROVENANCE_PIN = SRC-SL-BRYNJOLFSSON-ROCK-SYVERSON-AEJ-MACRO-2021--v1.0 — basis: explicit version-pinned public provenance of this ClaimVersion (Amendment v1.2 §6): the pinned field-6 Source record "Brynjolfsson, Rock & Syverson, “The Productivity J-Curve: How Intangibles Complement General Purpose Technologies,” American Economic Journal: Macroeconomics 13(1), 2021".