Moynahan presents a decomposition of the bond’s expected returns detailing various components and focuses on roll down return. He adds the following footnote: “The roll down return demonstrates how the price of a bond typically moves closer to par regardless of yield curve changes over the strategy horizon.
Roll down return不就是假设利率不变的情况下，随着到期日临近，债券价格朝面值的变动率吗，请问文中的句子哪里错了
