Almost 54% of traders, market makers and other securities market professionals said a lack of liquidity poses the greatest potential problem for investors during extended hours trading sessions, according to a poll conducted by the Security Traders Association; and 41% of the 1,010 respondents said price volatility would be the biggest source of investor concerns. A total of 777 respondents 77% said they favor an industry-wide, coordinated approach in launching extended trading hours; and 15% said each exchange or electronic communication network should begin trading after normal market hours when it is ready. "STA members have seen the liquidity and price volatility problems caused by low trading volume in past attempts at late trading, said Lee Korins, STA President. "They have no reason to believe these issues have been fully addressed as yet. Thats a big part of the reason the market professionals are so strongly in favor of a coordinated approach to extended hours.