The largest and most well known stock exchange is the New York Stock Exchange (NYSE). In the NYSE the trading takes place face to face, and is run by specialists known as “market makers” who manage all trading for particular stocks. The specialists match up buyers and sellers for the stock they manage. The price normally discussed for a stock is the price it was last traded at, but all sales are effectively auctions. The “real” price for any stock is what someone else is willing to pay for the stock (or what someone is willing to sell it for, depending on which your perspective). This type of stock exchange, where buyers and sellers are matched directly, is called a “Listed Exchange” [1,2].