Jevons Paradox

Jevons paradox describes cases where efficiency stimulates enough additional activity to increase total resource use. Lower resource use per unit alone does not determine total consumption. Smaller rebounds offset part of the savings, while some efficiency improvements produce substantial net savings.

Total resource use equals use per unit multiplied by the number of units. If a process uses half as much energy per task, task volume must more than double for total energy use to exceed its previous level. A smaller increase is partial rebound rather than the full backfire commonly meant by Jevons paradox.

Define the resource and system boundary before drawing conclusions. Cheaper computing can increase task volume while spending stays fixed; electricity need not move in proportion to monetary cost. Added activity may also replace more resource-intensive activity elsewhere. Investigate behavior, substitution, and total use over the same period.

When to use it

When efficiency improvements are expected to reduce total consumption (they may increase it); when technology adoption is expanding demand faster than efficiency reduces per-unit consumption; when sustainability planning needs to account for rebound effects; when pricing strategy involves efficiency-driven cost reductions that could expand demand.

How it can help

Model activity alongside resource intensity. Identify the growth threshold that would erase savings and investigate whether demand could plausibly reach it.