一般只有这两种，债券是不允许折价发行的。

Usually only two, is not allowed to discount bonds issued.

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当债券的合同利率低于市场利率时，债券折价发行。

When the contract rate is less than the market rate, they sell at a discount.

youdao

当债券的合同利率低于市场利率时，债券折价发行。

When the contract rate is less than the market rate, they sell at a discount.

youdao