---
title: "IBM's market share reportedly fell from ~50% (1969) to 37% (1982) during its antitrust suit, partly via deliberate price hikes to look less dominant"
type: "claim"
status: "seedling"
writer_model: "claude-sonnet-5"
audit_status: "flagged (unverified-quant — needs primary). Specific market-share percentages and the raise-then-cut pricing sequence are quantitative/mechanism claims resting only on a Tier 3 blog post. See [[question-verify-ibm-market-share-price-strategy-during-antitrust-suit]]. APPENDED 2026-07-12 (cross-model audit, auditor claude-fable-5): source pointer re-verified by direct fetch — the post exists and carries the figures and mechanism exactly as recorded. Two provenance corrections: (1) source_quote held only the post title, not a supporting passage; replaced with the verbatim claim-bearing passage. (2) The claim-bearing passage is not the blog author's own analysis — it is a block quote from Richard Epstein, 'Beware of Populist Antitrust Law' (Forbes, 2019-01-23), verified present at forbes.com by direct fetch; the post's named byline is Alec Stapp, not the venue. source_author corrected; Epstein chain recorded in body. Tier 3, unverified-quant flag, and seedling status unchanged — Epstein's column is a named scholar in his own venue (arguably Tier 2) but gives no citation for the figures or the pricing mechanism, so the numbers still lack a primary home (trial record, Fisher's analysis, or period IDC data) and the flag is doing its job."
source_url: "https://truthonthemarket.com/2020/02/03/the-ghosts-of-antitrust-past-part-2-ibm/"
source_title: "The Ghosts of Antitrust Past: Part 2 (IBM)"
source_author: "Alec Stapp (Truth on the Market), block-quoting Richard Epstein (Forbes, 2019-01-23)"
source_date: "2020-02-03T00:00:00.000Z"
source_quote: "IBM was able to strengthen its antitrust-related legal position by reducing its market share, which it achieved through raising prices. When the suit was discontinued that share had fallen dramatically since 1969 from about 50 percent of the market to 37 percent in 1982. Only after the government suit ended did IBM lower its prices in order to increase market share."
source_tier: 3
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-baxter-ibm-att-same-day.md, 2026-07-11"
origin: "batch"
derived_from: ["10-inbox/raw/2026-07-09-hop-baxter-ibm-att-same-day.md"]
date_created: "2026-07-11T00:00:00.000Z"
tags: ["computing-history","ibm","antitrust","unverified-quant","market-structure","business-history"]
audits: ["2026-07-12 claude-fable-5"]
---


During the roughly 13 years *[[entity-united-states-v-ibm|United States v. IBM]]* was pending (1969-1982),
IBM's share of the computer market reportedly fell from about 50% to about
37%. Per "The Ghosts of Antitrust Past: Part 2 (IBM)" (Alec Stapp, Truth on
the Market, 2020), this decline was achieved in part because IBM
deliberately raised prices to appear less dominant while the case was live,
only cutting prices again once the suit was dropped in 1982.

The claim-bearing passage in Stapp's post is not his own analysis — it is a
block quote from Richard Epstein, "Beware of Populist Antitrust Law"
(Forbes, Jan. 23, 2019), where the same three sentences appear verbatim
(verified at both URLs, 2026-07-12). Epstein is a named legal scholar
writing in his own column — closer to Tier 2 than the Tier 3 blog quoting
him — but he attaches no citation to either the 50%/37% figures or the
raise-then-cut mechanism, so the chain still terminates in an uncited
assertion rather than a primary record.

**Flag — `[unverified-quant — needs primary]`.** Both the specific
market-share figures (50% -> 37%) and the raise-then-cut pricing sequence are
exactly the kind of number and mechanism claim the sourcing floor
(`00-meta/specs/sources.md`) requires Tier 1-2 for — a blog's retelling of
antitrust history is a lead to a primary record (DOJ trial exhibits, IBM's
own filings, or a scholarly antitrust-economics treatment of the case), not
a citable source for the figures themselves. The Epstein column the blog
quotes does not discharge the flag: a statistic's primary home is the
trial record or period market data (e.g. IDC figures), and Epstein cites
neither. Verification is routed at
[[question-verify-ibm-market-share-price-strategy-during-antitrust-suit]].

This decline unfolds across the same suit whose dismissal is covered in
[[claim-baxter-dismissed-ibm-case-same-day-att-breakup-finalized]], and sits
against the backdrop of [[entity-john-cullinane|John Cullinane]]'s contemporaneous claim (recorded
separately) that the antitrust case had little to do with what actually
built the software industry — see
[[claim-cullinane-called-ibm-unbundling-software-industry-origin-myth]].

> [!note] Seek's commentary:
> The "raise prices to look less dominant" mechanism is the most interesting
> part of this claim and also the part I trust least on a single blog
> source — deliberate self-sabotage-for-litigation-optics is a strong claim
> about corporate behavior that deserves a primary trial record or a
> named antitrust economist's account before I'd treat it as settled. — Seek