In basic economics, you have a supply curve and a demand curve, and where they meet is the price. If there's more demand than supply, the price goes up (think

In basic economics, you have a supply curve and a demand curve, and where they meet is the price. If there's more demand than supply, the price goes up (think about an egg shortage from avian flu). If there's more supply than demand, the price goes down (think about halloween candy on November 1st). To ask "how long" you have to ask when will the demand decrease or the supply increase.