driven system, which matches buying and selling orders of the investors. Investors can place their orders with TSE accredited brokers, who enter these orders into the trading system. Then, the system automatically matches buy and sell orders of a particular security based on the price and quantity requirements. The mechanism for which the price of equities is determined is as follows: The best price (price priority) Time of order priority Under the price priority rule, a selling (buying) order with the lowest (highest) price takes precedence. Under the time priority rule, an earlier order takes precedence over others at the same price. Thus, when the lowest sell and the highest buy orders match in price, the transaction is executed at the price. In short, the TSE market is a pure order-driven Market. The trading system also generates and displays details of current and historical trading activity, including prices, volumes traded and outstanding buy and sell orders. This ensures that investors have the required information to be able to take informed investment decisions. The range of price movements is typically restricted to 3% daily either way from last closing (raised to 5% since May 2015). Restriction on Rights is 6%. This can be changed in specific situation by the Board of the TSE in case of unusual price movements resulting in an extremely high or low P/E ratio. Short selling is not permitted. There are no minimum trading lots. According to the Iranian Commercial Law, companies are prohibited from share repurchases. TSE Services Company (TSESC), who is in charge of the site, supplies computer services. TSESC is a member of Association of National Numbering Agencies (ANNA). Market segmentation Besides the Main and Secondary Market, there is a Corporate participation certificates Market (corporate bonds). Secondary Market is an exchange facility where the listed securities of small and mid-size companies can be traded efficiently and competitively. Any company, domestic or foreign, can list their products on the exchange for as long as they meet the listing criteria. The value of three markets of Securities and Stock Exchange, Over-the-Counter (OTC) stock exchange and commodity exchange hit $100 billion in December 2010. In 2010, the Kish Stock Exchange was launched to facilitate foreign investment and monetary activities in Kish Island free trade zone. TSE rate Since 1998 importers and exporters have also been permitted to trade foreign-exchange certificates on the TSE, creating a floating value