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In a market, sellers offer their products at a price, and buyers express their desire to buy by offering to pay the price. If the market price is too high, people buy less than what sellers wish to sell; the resulting surplus will push the price down. If the price is too low, consumers attempt to buy larger quantities than what sellers are able or willing to sell at that price. A shortage develops and price will increase. If the price is such that sellers want to sell the same amount that buyers want to buy, then the market is at equilibrium and the market price is the equilibrium price. The market equilibrium price is not always the most socially desirable price. In this section we explore the mechanics of the market system.

Internet resources

http://www.ns.ec.gc.ca/udo/wastepap.htm--supply and demand for recycled paper--guide