Exhaustible

Exhaustible describes a resource that is finite in quantity and can be depleted through continued use. When a stock is exhaustible, its total amount is limited and cannot be replenished on a human time scale. The term is commonly used in environmental science and resource economics to distinguish such resources from renewables or inexhaustible resources.

Typical exhaustible resources include fossil fuels (oil, coal, natural gas) and many metal ores and minerals. Some water resources and groundwater in non-replenishing aquifers may be treated as exhaustible if recharge is slow relative to extraction. The exhaustibility of a resource depends on the rate of use versus natural or technological regeneration; over long timescales, even renewable resources can become exhaustible if the rate of use exceeds regeneration.

In economics, exhaustible resources are analyzed for optimal extraction paths, considering scarcity rents and irreversible decisions. Prices and investment incentives may rise as stocks decline. The Hotelling rule describes that, under certain conditions, the net price of an exhaustible resource grows at the rate of time preference.

Policy and management focus on sustainable extraction, substitution with renewable or less-deplete resources, efficiency improvements, recycling, and technological innovation to extend the service life of exhaustible resources.