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Global stocks soared and US markets powered to fresh records Friday after the Bank of Japan surprised investors with a sharp increase to its stimulus operations. The policy switch, aimed at countering a slowdown in the Japanese economy, delivered a much-needed boost to equities from Asia to the Americas after a slow week marked by the US Federal Reserve's announcement of the end of its own huge quantitative easing program. "Just as the Fed takes away the punch bowl, the BoJ has turned up with a crate of sake," said Capital Spreads dealer Jonathan Sudaria, on the diverging monetary policies. In Japan, the Nikkei index added 4.8 percent to its highest level since November 2007.