THE automated trading system introduced by the National Stock Exchange of India has addressed many of the problems that have plagued the country's securities market, says the exchange's deputy managing director, Ravi Narain. Mr Narain said the screen-based system was helping to attract overseas brokerage houses and investors to the country. He said turnover had grown tenfold and was now averaging six to eight million shares a day. Mr Narain said the exchange was planning a derivatives market following the lifting of a government ban on such trade.