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The Jevons paradox is the possibility that using a resource more efficiently can ultimately increase total consumption of that resource. Efficiency can make a service cheaper to use, encouraging additional demand that offsets some or, in the stronger case of backfire, more than all of the expected savings. It is a possible outcome—not a rule that efficiency always increases resource use.
How can efficiency increase resource use?
Efficiency means getting more of a service from each unit of a resource. If an improvement lowers the effective cost of that service, people or businesses may use it more. For example, a household might use a cheaper-to-run service more often. That extra use can reduce the savings that the efficiency improvement was expected to deliver.
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Effects can also extend beyond the original service: money saved or productivity gained may be spent or invested elsewhere, with further resource implications. These are possible pathways, not outcomes that happen for every user. The UK Department for Energy Security and Net Zero defines rebound effects as expected efficiency-based savings that “bounce back” through increased consumption induced by the efficiency measure (report listing, published 24 March 2026).
Rebound versus backfire
Rebound is the broad term for expected savings that are partly or wholly offset by consumption induced by an efficiency improvement. Backfire is the stronger case: the increase in use exceeds the expected savings, leaving total resource consumption higher than it would have been without the improvement. A rebound effect therefore does not automatically mean backfire.
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Where the idea came from
The paradox is associated with economist William Stanley Jevons and his 1865 book The Coal Question. Jevons considered how improvements in the economical use of coal in engines doing mechanical work could lead to greater overall coal consumption rather than simply conserving coal. A 2005 historical review describes his argument as extending to coal, iron and other resources (Blake Alcott, “Jevons’ paradox,” Ecological Economics).
The Coal Question is useful as a historical primary source for the origin of the idea; it is not a current empirical assessment of how rebound works today.
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Does energy efficiency always increase energy use?
No. The paradox describes a possibility, not an automatic law. Whether lower costs lead to enough extra demand to offset savings depends on the resource, sector, geography, people or businesses involved, and the boundaries used to measure consumption. The UK Department for International Development’s review of rebound effects in developing countries likewise describes variation across sectors, countries and agents (report).
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Evidence for backfire is contested. In a 2009 review, Steve Sorrell concluded that evidence in favour of Jevons paradox was “far from conclusive,” while suggesting economy-wide rebound effects may be larger than conventionally assumed (“Jevons’ Paradox revisited: The evidence for backfire from improved energy efficiency,” Energy Policy). The review also identifies weaknesses in arguments supporting backfire. Its conclusions do not establish that efficiency gains generally raise total energy use.
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What the newer nitrogen example shows—and does not show
A 2026 International Monetary Fund working paper broadens the discussion beyond energy. It reports a U-shaped relationship between nutrient nitrogen efficiency and total world nitrogen use in agriculture over 1960–2014 (working paper).
This is an observed empirical pattern over a specified period, not a general rebound percentage or proof that efficiency caused the pattern through one particular mechanism. The paper notes that the relationship alone does not explain the mechanisms at play. It should therefore be treated as an example for investigation, not evidence of a universal law across resources.
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How to interpret claims about rebound
- Check what is being measured: efficiency, resource consumption, or the service delivered by the resource.
- Distinguish direct extra use of a service from wider economy-wide effects.
- Look at the time period, geography and system boundary; totals can depend on what the analysis includes.
- Do not treat an observed relationship as proof of a causal mechanism without supporting evidence.
- Be cautious with a single rebound percentage: the reviews cited here do not establish one value that applies across sectors.
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