The principle was absolutely right: unless default is a possibility, bond investors have no reason to distinguish between good and bad credits.
这个原则是完全正确的。除非预设是可能的，债券投资者没有原因去分辨好的和坏的信贷。
On the basis of principle, the reason and influencing factors of the questions are analyzed. The means for solving questions is put forward, and taking good effect is proved through practice.
从原理上分析了产生问题的原因和影响因素，提出了解决问题的办法，并经实践证明取得了较好的效果。
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