Japan’s 10-year bond yield dropped to a record minus 0.135 percent Friday, falling below the the negative deposit rate introduced by the Bank of Japan last month, after the central bank’s operation to buy long-term debt met the lowest investor participation on record. Yields on government debt have tumbled since the BOJ announced Jan. 29 that it would start charging 0.1 percent interest on some deposits held at the bank starting Feb. 16.

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