Jevons paradox
Jevons paradox is the counter-intuitive finding that making the use of a resource more efficient often increases total consumption of it — because greater efficiency lowers the effective cost and unlocks many new uses.
How does the Jevons paradox work?
Efficiency is a price cut in disguise. When a resource gets cheaper to use, demand expands — more users, more applications — and the extra usage can outweigh the saving per unit, so the total goes up rather than down.
Making a resource more efficient to use often increases how much of it we consume.
How do you use the Jevons paradox?
- Policy and forecasting: don’t assume an efficiency gain automatically cuts total resource use (energy, water, compute).
- Strategy: cheaper inputs can grow a whole market rather than just trim costs.
- Pair with second-order thinking on any “we made X more efficient” claim — ask what the lower cost will unleash.
What does the Jevons paradox look like in practice?
Economist William Jevons noticed in 1865 that more efficient steam engines didn’t reduce Britain’s coal use — they made coal-power cheaper, so it spread to more industries and total coal consumption rose. The pattern recurs: efficient lighting, engines, and computing have each expanded total usage.
Where does the Jevons paradox fail?
It’s a tendency, not an iron law — the rebound can be partial, and the paradox doesn’t mean efficiency is futile. The real lesson is to measure the net effect rather than assume the per-unit saving is the whole story.
- The rebound is largest when demand is elastic and the resource dominates cost; where demand is saturated, efficiency simply saves.
- It operates at the level of whole systems over time — a single firm's efficiency gain can still reduce that firm's own consumption.
- Extending it to every domain — attention, safety, computing — is tempting, but each extension needs its own evidence of induced demand.
The counter-model: Via negativa — If efficiency gains induce more consumption, via negativa cuts total use directly — removal and caps don't rebound.
How do you apply the Jevons paradox, step by step?
- Before banking savings from an efficiency improvement, identify the resource whose per-unit cost just fell.
- Ask who gains new uses for it now that it is cheaper.
- Estimate whether induced demand is likely: is appetite for the resource elastic or saturated?
- Measure total consumption after the change, not per-unit efficiency.
- If totals rise, pair the efficiency gain with a cap or budget on absolute use.
Frequently asked
- What is Jevons paradox?
- The observation that improving the efficiency with which a resource is used can increase, rather than decrease, the total amount of that resource consumed.
- Who discovered Jevons paradox?
- English economist William Stanley Jevons, in his 1865 book The Coal Question, observing coal use after more efficient steam engines.
- Does Jevons paradox mean efficiency is pointless?
- No — efficiency still delivers value per unit. It means total consumption may not fall, so net resource effects must be measured, not assumed.
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ReadGlobe. (2026). Jevons paradox. https://readglobe.com/model/jevons-paradox/
"Jevons paradox." ReadGlobe, 30 June 2026, readglobe.com/model/jevons-paradox/.
Primary source: Wikipedia
Editorial synthesis © ReadGlobe 2026, drawing on the mental-models tradition (Charlie Munger, Farnam Street) and the primary sources for each model. · Last reviewed 2026-06-30.