Losses are modest in U.S. , Seoul , Tokyo and Shanghai . Investors are weighing both the downgrade and the Middle Eastern debt crisis . Treasury Secretary Tim Geithner had been expected to take part in a conference call with representatives of the other G7 nations to discuss the downgraded U.S. credit rating , a G7 official told CNN . G7 leaders say they are committed to taking `` all necessary measures '' Seoul stock futures tumble 1.6 % in early electronic trading .
Losses are modest in U.S. , Seoul , Tokyo and Shanghai . Investors are weighing both the downgrade and the Middle Eastern debt crisis . G7 leaders say they are committed to taking `` all necessary measures '' Seoul stock futures tumble 1.6 % in early electronic trading .