Finance Minister P Chidambaram says, there is a need to expose the functioning of stock market and deal with insider trading issues to inject confidence in retail investors. Chidambaram was speaking at the inauguration of the new stock exchange MCX-SX in Mumbai on Saturday.Expressing concerns over malpractices in equity trading, Chidambaram said that the stock exchanges in India including NSE and BSE and the new one MCX-SX, should endeavor to keep the products simple which could be easily understood by small investors.Admitting that there are malpractices in the Indian stock market, Chidambaram said that market regulators should be one step ahead of innovation by manipulators. He informed that India has the largest number of listed companies in the world. He said the stock markets would become more competitive with the entry of MCX-SX. The newly launched stock market MCX-SX in Mumbai will start functioning from Monday.