An electronic board shows the Nikkei share average and the Japanese yen's exchange rate against the U.S....
An electronic board shows the Nikkei share average (above) and the Japanese yen's exchange rate against the U.S. dollar and mojor foreign currencies at the Tokyo Stock Exchange in Tokyo April 11, 2014. Japanese shares tumbled to six-month lows on Friday and posted their biggest weekly fall since the March 2011 tsunami and nuclear disaster after a rout in U.S. tech shares spurred selling by momentum players. REUTERS/Issei Kato (JAPAN - Tags: BUSINESS)