Why Do Prices Fluctuate?
A market is a place where buyers and sellers come together for voluntary exchange, and price is determined by supply and demand. If more people would like to buy at a certain price than are willing to sell at that price, then buyers will buy out the stock and there will be a shortage. This gives sellers more incentive to produce, because it indicates to them that even if it costs them more, it's worth it. In this case, price rises, and equilibrium is restored.
The system works in the return direction, to reduce price, as well. If more people would like to sell at a certain price than would like to buy, there is a surplus. To reduce inventories, sellers lower the price and cut back on production, and buyers purchase the item at the new, lower price.
Edit: For example, FBSS's, sold at 13,000pp, sell almost instantly, and have been for a long time. Thus, people have figured out, they can sell them for more. Not every item is higher in value, in fact, a large number of items right now are LOWER then previous market values.
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