HOTELLING'S RULE: The notion that efficiency and competitive market forces will lead to an increase of scarcity rent of a finite, exhaustible resource that is equal to the interest rate. The logic behind Hotelling's Rule is that as a finite fossil fuel is depleted, less is available in the future, causing scarcity rent, and thus the resource price, to increase. An increase in the resource price reduces the quantity demanded and conserves more for future consumption. When finite, exhaustible resource markets are competitive, this process generates an efficient allocation over time. See also | efficiency | competitive market | scarcity rent | exhaustible resource | interest rate | price | quantity demanded | consumption | allocation | investment | switching point | natural resources | recycling |