What is the rebound effect (Jevons paradox)?

The rebound effect is the mechanism by which improved energy efficiency, instead of reducing total energy consumption, tends to increase it: what becomes more efficient becomes cheaper, hence more used. Described by the economist William Stanley Jevons as early as 1865, it remains the blind spot of most energy-efficiency policies.

The origin: Jevons and the steam engine

In The Coal Question (1865), Jevons observes a counter-intuitive fact: the steam engines of his day, far more efficient than Newcomen’s a century earlier, did not reduce England’s coal consumption — they made it explode. The reason is economic: a machine that draws more work from each ton of coal lowers the cost of that work, opens up new profitable uses and multiplies machines. “It is wholly a confusion of ideas to suppose that the economical use of fuel is equivalent to a diminished consumption,” he writes. “The very contrary is the truth.”

The mechanism was rediscovered and generalised by contemporary energy economics — notably under the name of the Khazzoom-Brookes postulate, after the work of Daniel Khazzoom and Leonard Brookes around the turn of the 1980s.

The three forms of rebound

The literature classically distinguishes three channels:

1. The direct rebound — the use that has become more economical is consumed more: a car that uses less fuel encourages more driving, a better-insulated home encourages heating more widely.
2. The indirect rebound — the money saved does not evaporate: it funds other consumption, itself carrying energy and matter (the plane ticket paid for by heating savings).
3. The macroeconomic rebound — across the whole economy, efficiency lowers the implicit cost of energy, which stimulates production, demand and innovation in new uses.

The size of each channel varies by use and sector; their sum is the subject of an abundant and debated literature. But the direction of the mechanism is hardly in doubt: ignoring the rebound systematically leads to overestimating the savings expected from efficiency policies.

Why the rebound is structural

The rebound effect is not a behavioural anomaly that better information would correct. It follows from the very logic of prices: efficiency makes the energy service cheaper, and a cheaper service is more in demand — from households, from firms, from uses that did not yet exist. That is why efficiency alone, without constraints on volumes, guarantees no fall in total consumption. The historian Jean-Baptiste Fressoz (Sans transition, 2024, in French) shows it over two centuries: energies never replaced one another, they added up — coal does not replace wood, it is added to it; oil is added to coal; and efficiency gains accompanied, rather than contradicted, this accumulation.

The anthropic reading: a boomerang effect

The anthropic framework of the economist Stéphane Lalut proposes to read the rebound effect as a case of boomerang effect: the efficiency gain produces a local order — less energy per unit produced, an improving balance sheet — whose cost comes back as a global disorder — more total consumption, more extraction, more waste.

This reading is developed in AWP-04 — Energy transition or entropic transfer? (2026), which places the rebound among three transfer mechanisms at work in the energy transition: extraction externalised toward lithium- and cobalt-producing countries, technological waste deferred to the coming decades, and the unaccounted rebound effect. What the three have in common: the disorder the transition claims to eliminate is not resolved, it is displaced — in space, in time, or by the detour of volumes.

The rebound effect incidentally shows why the anthropic question — where does disorder go? — is not rhetorical: in the case of the rebound, disorder comes back through the least visible channel there is, the aggregation of millions of individually rational decisions.

Efficiency or sufficiency

The practical consequence is known to serious energy scenarios: efficiency is necessary but not sufficient. Without a mechanism that constrains or steers volumes — sufficiency, caps, pricing — efficiency gains feed demand instead of reducing consumption. The question posed by the anthropic framework goes one step further: when a mechanism does reduce consumption here, it remains to check where the cost has moved — toward which territories, which groups, which decades.

Frequently asked questions

Rebound effect, Jevons effect, Jevons paradox: are they the same thing? The rebound effect is the general phenomenon — any recovery of consumption that eats into an efficiency gain. We speak of the Jevons paradox (or effect) in the extreme case where the recovery exceeds the gain: total consumption rises. The short definition is in the glossary.

Does the rebound effect apply outside energy? Yes. The mechanism is observed wherever an efficiency gain lowers the cost of a use: transport time (speed gains lengthened distances rather than shortening journeys), digital technology (processor efficiency fed the explosion of uses), materials.

Can the rebound effect be “corrected”? It can be contained — by coupling efficiency with volume constraints — but not abolished by technology alone: it follows from prices, not from a consumer error. The first step is to count it, which the forecast assessments of efficiency policies still often omit.

Further reading

• AWP-04 — Energy transition or entropic transfer? — the working paper that places the rebound effect among the transfer mechanisms of the transition (DOI: 10.5281/zenodo.19269244, open-access PDF).
• What is anthropy? — the general framework: local order, displaced disorder, boomerang effect.
• The book ANTHROPY – A Big History of Civilization’s Hidden Costs (2026, 632 p.) devotes a chapter to energy and to the transfers of the transition.

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