A flatyieldcurve is bad for the profitability of Banks, whose business is to borrow short and lend long.
平坦的收益率曲线不利于银行盈利，因为银行的业务是短借长贷。
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But the fact that the BoJ is pinning rates is helping to maintain a flatyieldcurve and wide spread with US rates, which in turn weakens the yen against the dollar.