BOJ stuns markets with surprise move to negative interest rates

By Leika Kihara TOKYO (Reuters) - The Bank of Japan unexpectedly cut a benchmark interest rate below zero on Friday, stunning investors with another bold move to stimulate the economy as volatile markets and slowing global growth threaten its efforts to overcome deflation. Global equities jumped, the yen tumbled and sovereign bonds rallied after the BOJ said it would charge for a portion of bank reserves parked with the institution, an aggressive policy pioneered by the European Central Bank (EC