Price determination is the task of the stock exchange. It determines the price on the basis of supply and demand, i.e. the willingness of market participants to buy or sell a financial asset. Central to the determination of the share price is the order book, in which buy and sell offers are compared for each security on the stock exchange. The prices are determined according to rules. The result is the price at which the most shares can change hands. The Scalable Broker offers trading through the gettex and Xetra stock exchanges.