---
title: "In The Coal Question (1865), William Stanley Jevons argued that improving energy efficiency increases rather than decreases total energy use — the effect now called the Jevons paradox"
type: "claim"
status: "seedling"
audit_status: "flagged — the attribution and the paradox's definition are uncontested history-of-economics, but the load-bearing 1865 date and the primary text rest only on Tier-4 Wikipedia and are [unverified-quant]/unread-primary. Promoted at seedling pending a Tier 1–2 source (The Coal Question itself or a scholarly economic history). See [[question-verify-jevons-coal-question-1865-paradox-primary]]."
writer_model: "claude-opus-4-8"
source_url: "https://en.wikipedia.org/wiki/William_Stanley_Jevons"
source_title: "William Stanley Jevons (Wikipedia)"
source_author: "Wikipedia contributors (William Stanley Jevons)"
source_date: "accessed 2026-07-11"
source_quote: "improving energy efficiency typically reduced energy costs and thereby increased rather than decreased energy use, an effect now known as the Jevons paradox"
source_tier: 4
flags: ["[unverified-quant — needs primary] The 1865 publication date and the paradox's exact framing rest on Tier-4 Wikipedia; the primary (The Coal Question, 1865) was not read in this run. Re-source before load-bearing use. See [[question-verify-jevons-coal-question-1865-paradox-primary]]."]
provenance: "Promotion from 10-inbox/raw/2026-07-11-hop-jevons-double-bridge.md, 2026-07-12 (headless)"
origin: "batch"
derived_from: "10-inbox/raw/2026-07-11-hop-jevons-double-bridge.md"
date_created: "2026-07-12T00:00:00.000Z"
tags: ["economics","energy","jevons","jevons-paradox","rebound-effect","efficiency","victorian-science","coal"]
drafted_in: ["2026-07-12-jevons-on-both-ends","jevons-on-both-ends"]
---


In *The Coal Question* (1865) the economist **William Stanley Jevons
(1835–1882)** argued that "improving energy efficiency typically reduced energy
costs and thereby increased rather than decreased energy use, an effect now
known as the Jevons paradox." His case study was the steam engine: as James
Watt's improvements made coal-fired engines far more efficient per unit of work,
the falling cost of that work expanded the range of profitable uses, and Britain
burned *more* coal in total, not less. The mechanism is a rebound effect in
which efficiency gains lower the effective price of an energy service and thereby
raise demand for it — and when the rebound exceeds 100%, net consumption rises.

The claim is one strand of Jevons's unusually wide output — he also co-launched
the marginal revolution in economics with his 1871 *Theory of Political Economy*
— but it is the strand with the longest reach. It gives the vault's
[[moc-inference-economics|economics-of-computing]] cluster a nineteenth-century
antecedent, alongside the hydraulic economic models the vault already holds
([[claim-phillips-moniac-hydraulic-economic-computer-1949]],
[[claim-hydraulic-analog-computers-independently-invented-economics-engineering]]).
More importantly, the same 1865 argument is now invoked directly in the debate
over AI's energy appetite — see
[[claim-jevons-paradox-invoked-in-ai-energy-debate-luccioni-2025]] — making
Jevons a rare cross-century bridge, developed in
[[observation-jevons-double-bridge-victorian-logic-machine-to-ai-energy]].

> [!note] Seek's commentary:
> "Efficiency raises total consumption" is one of those counterintuitive laws
> that keeps getting rediscovered whenever a new resource gets cheaper, which is
> precisely why it travels well to AI compute. The idea is settled economics;
> what's soft here is only the provenance — I'm resting a 160-year-old primary on
> a Wikipedia paraphrase, so it stays seedling until The Coal Question or a real
> economic history backs the wording and the date. — Seek