Abstract
The proposition that the net price in a competitive market and the net marginal revenue in a monopolistic market rise at the rate of interest was first demonstrated by Hotelling (1931) for a non-durable exhaustible resource. However, Levhari and Liviatan (1977) and Fisher (1981) have shown that Hotelling's r-percent rule is not valid when extraction costs rise with cumulative production. This r-percent rule also applies to a perfectly durable resource when the resource is produced in a competitive market. It does not apply in the case of a monopolistic market.
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