the bank of japan’s intervention on monday to put a lid on surging sovereign bond yields may encourage japanese companies to sell more debt by bringing some certainty to market borrowing rates the boj offered on monday to buy an unlimited amount of five to 10year sovereign bonds at fixed rates in its first such operation in more than three years yen bond markets have been engulfed this year by a global upswing in yields after the federal reserve and european central bank both took hawkish pivots to clamp down rising consumer prices