| 摘要 |
A method of controlling consumption of a commodity, particularly an addictive commodity, includes issuing a license, in advance of any purchase, to a purchaser of the commodity. The license allows purchase of a specified quantity of the commodity within a specified time period. The license is issued for a license fee that is set according to a schedule that divides the specified quantity into ranges, and charges different per unit base fees for purchases in different ones of those ranges. When a purchase is made, the license is checked to see if the purchase is allowed, and then updated to reflect the quantity purchased. Excessive consumption may be penalized by charging a higher rate for a new license in the same period, while surrender of one's license may be rewarded with incentives. The license fee may include the purchase price of the licensed quantity of the commodity.
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