SECURITIES

Nasdaq Proposes Changes to Improve Stock Trades: The market rolled out several new proposals aimed at improving how its dealers trade stocks listed on other exchanges. The proposals could give investors better prices and speed execution of these orders, officials said. The proposals arise from the lengthy “Market 2000” study released by the Securities and Exchange Commission in 1993, which examined ways the nation’s markets can work more efficiently. Nasdaq executives said the proposed rules have been in the works for some time and aren’t a response to the SEC and Justice Department’s antitrust investigation of the over-the-counter exchange.