The Deflation Index is open. Excel workbooks with formulas intact, JSON files for scripting, primary sources, full methodology — free to read, use, cite, and build on.
Everything lives on GitHub. The repository is the source of truth — every Excel file, every JSON, every source citation, every release note. Fork it, clone it, open issues, send pull requests.
Current release: v3.0.3 (1990–2024, released January 2026). See versions for what's coming.
The Excel workbooks are the working files. Every cell is traceable: constants, yearly data, sector indices, the weighted composite. Nothing is baked into a value when a formula would do.
The full weighted index. Computing, communications, energy, and transportation combined into the headline deflation number, with per-sector sheets, weight calculations, and monetary context (M2, CPI) carried through.
Each of the four sectors is also maintained as a standalone workbook — useful if you want to inspect a single sector's inputs, weighting, and sources without opening the master.
If you're building a chart, an API consumer, or just want the numbers without opening Excel, the JSON files under data/ are the canonical programmatic source. Each file has a schema, a provenance block, and a retrieval date.
data/constants.json
Master statistics: DI, M2, CPI annual values, sector weights, gap analysis, and the v3.1 supplemental_2025 block
data/api/master_index.json
Deflation Index values 1990 → 2024 with annual summary
data/api/m2_data.json
M2 money supply annual time series (FRED M2SL)
data/api/sectors.json
Per-sector breakdown: computing, communications, energy, transportation
data/api/weights.json
Primary and equal-weighted variants with sensitivity summary
No synthetic indices. No blended proprietary estimates. Every data point comes from a government agency, an international body, an industry survey, or peer-reviewed research — cited at the cell level in the workbooks and consolidated in one file for reference.
Examples: FRED (M2, CPI), IRENA (renewable LCOE), BloombergNEF (battery pack prices), FCC (broadband subscriptions and speeds), DOE (transportation energy, solid-state lighting), Epoch AI (GPU price-performance), Nordhaus (long-run computing), Sandberg & Bostrom (compute trends), among others.
The Deflation Index follows a two-track release cadence: a major annual refresh when IRENA and NREL publish their year-in-review reports (typically summer), and interim updates as clean primary data becomes available.
Full update plan with source-by-source status: v3.1 2025 update plan.
The Deflation Index is released under Creative Commons Attribution 4.0 International (CC BY 4.0). You can copy, redistribute, adapt, remix, and build on the data — including for commercial use — provided you credit the source.
Found a problem, want to add a sector, or have better primary data? Open an issue or send a pull request on the repo. This is an open research project; it gets better with critical readers.