Involves

Idea

Multiply efficiency by how often it gets used

Suppose a machine requires half as much energy per task. If the number of tasks stays fixed, energy use falls. If cheaper tasks encourage three times as much activity, total use rises instead. The machine is more efficient in both cases. Total energy use depends on how much it runs.

Economists call an offset to expected savings a rebound effect. The stronger case, in which the offset exceeds the savings, is often called backfire or Jevons paradox. A partial rebound reduces the savings; backfire reverses them.

Less per use does not settle the number of uses.

Measure the total after demand responds.

Where it breaks down

Backfire is a possibility, not a law attached to every efficiency improvement. Prices, saturation, regulation, and other constraints affect the response.

How it connects

Demand response explains how an efficient process can expand its own use.

This idea appeared in When using less makes us use more, the Involves connection for October 21, 2026, which asked: Can a more efficient machine increase total resource consumption?

Check yourself

What is missing from a per-task energy estimate?

How the number of tasks changes. Exactly. Total consumption depends on scale as well as resource use per task.

What the sources establish

  • Rebound need not erase all savings; backfire is the stronger outcome.

Sources