When the contract rate is less than the market rate, they sell at a discount.
当债券的合同利率低于市场利率时，债券折价发行。
But the research literature on discount rate is very few in normal market structure.
而在一般市场结构中，折扣率的研究文献就很少。
But the research literature on discount rate is very few in normal market structure.
而在一般市场结构中，折扣率的研究文献就很少。
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