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A CNBC survey of economists indicates the Bank of Japan is expected to raise interest rates by 25 basis points, which would take the benchmark rate to its highest level in roughly three decades. The expected move reflects Japan's continued shift away from the ultra-loose monetary policy that has defined its economy for years. The anticipated hike comes as central banks worldwide grapple with divergent inflation and growth pressures, with Japan's tightening path standing in contrast to policy debates elsewhere, including the U.S. Federal Reserve's own upcoming meeting.