" There can be a reserve demand for a depletable resource, just as there is speculative reserve demand for any other stock of goods on the market. This speculation is not simple wickedness, however; it has a definite function, namely, that of allocating the scarce depletable resource to those uses at those times when consumer demand for them will be greatest. The speculator, waiting to use the resources until a future date, benefits consumers by shifting their use to a time when they will be more in demand than at present. "

― Murray N. Rothbard , Man, Economy, and State / Power and Market: Government and Economy