It’s infuriating with every inflation print: Some economist or strategist waves off the recent headline quantity, advising you to deal with the core. The newest bout of innumeracy has been occurring for 4 years, however it dates again to at the least the 2000s (and past).
There’s a lengthy — and IMO, disgraceful — historical past of making an attempt to underreport inflation knowledge. Most individuals are unaware of it. This publish will function a reminder that since World Conflict Two, American governments have labored to scale back the reported inflation knowledge—accuracy be damned.
1944-45: Mitchell Committee. Derives from the struggle over wartime value controls and the Value-of-Dwelling Index (COLI). The reputable accusation was that it understated wartime inflation as items grew to become unavailable, wages froze, and black-market pricing took over. COLI understated value will increase by 4 proportion factors from 1941–44.
The BLS response: In 1945, the information collection was renamed the “Client Worth Index” and described as a fixed-basket value index.
1953: Postwar Basket Revisions. Complete revisions rebuilt the products basket from an earlier 1950 survey – the primary since 1934–36.
1961: Stigler Committee. The Worth Statistics Evaluation Committee acknowledged that CPI ought to be reconceived as a cost-of-living index. This included a collection of well-intentioned modifications (new-goods bias, high quality change, substitution, together with hedonic changes).1
1972-75: Core Inflation. BLS’s “all objects much less meals and vitality” collection dates again to 1957, however it was not a coverage focus till the Seventies period of stagflation. After the 1972–73 meals value spike, Fed Chair Arthur Burns had the Fed employees strip out meals as “climate, not financial coverage”; then, after the embargo, vitality was eliminated. Quickly after, it was used automobiles, cell houses, kids’s toys, and so forth till solely a fraction of the basket remained.
Therefore, my 2005 phrase for this: “Inflation Ex-Inflation.”
Over the following many years, this was adopted by the Cleveland Fed’s median/trimmed-mean CPI (1994), the Dallas Fed’s trimmed-mean PCE (2005), Atlanta’s sticky-price CPI (2010), and Powell’s “supercore” companies ex housing (2022).2
The issue for shoppers: You’ll be able to’t eat core.
1983: House owners’ equal hire. The most important change within the basket, one with perverse, very counterintuitive outcomes, particularly main as much as the GFC and afterward.
Earlier than 1983, homeownership was an asset-price plus mortgage-interest price. However mortgages hit 18% in 1981, inflicting the CPI to surge; Nineteen Eighties COLAs had been large! BLS moved CPI-U to rental equivalence in January 1983; BEA’s PCE had used rental equivalence all alongside.
It was a defensible idea; a home is an appreciating asset whereas shelter is a client good. However the 2002–07 housing bubble didn’t present up in CPI, as a result of hire costs had been restrained by hundreds of thousands of People stampeding into no-doc, ARM mortgage, dwelling possession purchases.3
We noticed this OER distortion rear its head throughout the 2021–23 shelter value lag.
1995–96: Boskin Fee. Greenspan testified in Congressional testimony in January 1995 that CPI overstated inflation by 0.5–1.5 factors.4 The Fee (Boskin, Dulberger, Gordon, Griliches, Jorgenson) reported in December 1996 that there was an upward bias of 1.1 factors a 12 months, with a variety 0.8–1.6.5
It was pure political bullshit.
The political goal was to scale back COLA and tax bracket creep, saving $1 trillion greenback deficit discount over the following decade or so. BLS applied it administratively.
In “Bailout Nation,” I talk about the position this stealth inflation performed within the disaster.6
Right here was my query within the 2000s: If inflation was correctly reported (e.g., pre-Boskin), would possibly the Federal Reserve have picked up the distortions within the backward, actual estate-driven economic system?
2017: Chained CPI as fiscal coverage. It’s ironic that the one Obama coverage thought adopted by Trump was the proposed C-CPI-U for Social Safety COLAs and tax indexing. It was applied within the 2017 Tax Cuts and Jobs Act.7
2000: Fed modifications its goal to PCE. February 2000 Financial Coverage Report shifted the Fed’s most well-liked gauge from CPI to PCE (broader scope, chained formulation, business-survey weights together with 3rd-party well being spending);
2004: Fed modifications its goal to Core PCE. Since 2012, the two% goal is a PCE goal. This lowered the inflation quantity the Fed is judged towards by ~0.5 pts/yr versus CPI.
2020–26: Annualizing. Weights moved to annual updates in 2023, a response to the pandemic basket shock. By October 2023, this created reporting points: a health-insurance smoothing repair, a 2022 new-tenant hire index to deal with shelter lag, and in 2025 BLS changed survey assortment with vendor transaction knowledge for leased automobiles (April 2025) and wi-fi companies (July 2025),
2025: Suspending CPI. DOGE firing and different staffing cuts led BLS to droop CPI assortment in a number of metro areas in 2025; it was changed with (LOL) imputation. Trump fired Commissioner McEntarfer on August 1, 2025, after a nasty jobs report, and the Antoni nomination that adopted didn’t undergo.
The 2025 episode is one thing model new, completely different, and a lot worse: not creatively re-measuring inflation downwards, however ceasing to measure it solely.8
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It’s no coincidence: Each main change since 1983 went in the identical path – decreasing the reporting of inflation knowledge, no matter rising costs, typically with dire penalties.
Technical modifications within the US have been almost all directional in the identical manner, and nearly at all times timed to a fiscal or political want.
Beforehand:
The Historical past of Inflation ex-inflation (September 23, 2005)
For Decrease Inflation, Cease Elevating Charges (January 18, 2023)
CPI Improve is Primarily based on Unhealthy Shelter Information (January 11, 2024)
CPI Shelter Measures: 6-12 Month Lag (February 15, 2024)
__________
1. In 1961 there have been no computerized federal COLAs; Social Safety indexation got here in 1972, tax brackets in 1985. The one CPI-linked cash at stake was union escalator clauses. BLS resisted for 35 years. Most 1996 Boskin Fee claims date again to 1961 Stigler.
2. The 1978 revision launched CPI-U (all city shoppers, ~87% of the inhabitants) alongside the wage-earner index, and WPI grew to become PPI. (See 1978: CPI-U vs CPI-W.)
I don’t consider this alteration as a CPI manipulation, however I’m open to being satisfied in any other case.
3. Analyst Josh Rosner famous that “A House With out Fairness is Only a Rental with Debt;” he wryly noticed this was not precise dwelling possession; it was “Renting with the appropriate to default.”
4. Was this perjury? Technically, no: “It’s not a lie in case you consider it.”
5. The main points: ~0.4 from upper- and lower-level substitution, ~0.1 outlet substitution, ~0.6 high quality change and new items.
6. From Bailout Nation:
“Throughout a lot of the 2003-2007 run-up in costs, the buyer value index (CPI), the official measure of inflation, hardly budged. Credit score the Boskin Fee for contributing to this phantasm of low inflation. The Boskin reforms modified not solely the basket of products measured for inflation however how we measure them. It allowed “hedonic changes” for the development of high quality. Neglect what the window sticker says; Your new automobile isn’t actually dearer—it’s higher.
Then there was substitution—for instance, when the worth of steak rises, shoppers can substitute it with hen on the earlier low costs. Within the topsy-turvy world of Boskin, substituted costs remained the identical. In the true world, inflation simply drove steak out of your value vary.”
7. Obama’s FY2014 funds proposed C-CPI-U for Social Safety COLAs and tax indexing, then withdrew it below strain from the left. After TCJA 2017, it chained CPI for bracket indexing was adopted completely. (Advantages nonetheless use CPI-W). This makes the index nearer ty the Boskin Mannequin – it will increase tax income by way of bracket creep.
8. The October–November 2025 shutdown produced one thing with out precedent: no October 2025 CPI launch in any respect; the information couldn’t be retroactively collected, and the November report omitted month-to-month modifications for the affected objects.
