The rebound effect occurs when an efficiency improvement lowers the effective cost of a service and changes behavior in ways that offset expected resource savings. More efficient lighting, transport, computing, or heating may be used more intensively because each unit of service becomes cheaper.
Types of rebound
- Direct: the improved service is used more.
- Indirect: saved money is spent on other resource-using goods or services.
- Economy-wide: efficiency changes prices, production, technology, and demand across sectors.
Rebound does not mean efficiency is useless, and it does not always exceed the original saving. Its size depends on context, demand elasticity, income, prices, infrastructure, and policy.
The feedback structure
Efficiency reduces resource use per unit. Lower operating cost increases affordability and use. Greater use offsets part of the initial reduction. At larger scales, expanding markets and infrastructure can reinforce demand.
Designing policy
Estimate behavioral response rather than multiplying efficiency by current use. Combine efficiency standards with absolute caps, pricing, demand management, clean supply, or land-use policy where appropriate. Measure total resource use and service demand, not only intensity.
Distribution matters: increased access can be socially beneficial even when it reduces aggregate savings. Policy should state whether its goal is affordability, emissions, resource security, or a combination.
References
- Sorrell, S. (2007). The Rebound Effect. UK Energy Research Centre.
- Gillingham, K., Rapson, D., & Wagner, G. (2016). “The Rebound Effect and Energy Efficiency Policy.” Review of Environmental Economics and Policy, 10(1), 68–88.
- Jevons, W. S. (1865). The Coal Question.
A simple numerical illustration
Suppose a device uses 20 percent less energy per hour. If lower operating cost causes usage hours to rise by 10 percent, total use falls, but by less than 20 percent. If usage rises enough to offset the efficiency gain, the expected saving disappears. The calculation should use consistent units and account for other changed behavior.
Why estimates vary
Rebound is larger when demand responds strongly to price, when unmet demand is high, and when efficiency enables new applications. It may be smaller when use is constrained by time, regulation, or saturation. Short-run and long-run responses can differ as infrastructure and habits adapt.
Questions for analysts
- What service does the resource provide?
- How will its effective price change?
- Which direct and indirect responses are plausible?
- Are savings spent elsewhere?
- Does production scale or technology direction change?
- What absolute outcome is the policy meant to achieve?
Report rebound as an empirical range with assumptions, not a slogan that efficiency always succeeds or always fails.
Discussion