NO.PZ2023091701000060
问题如下：
A fixed-income portfolio manager purchases a seasoned 5.5% agency mortgage-Backed security with a weighted average loan age of 60 months. The current balance on the loans is USD 20 million, and the conditional prepayment rate is assumed to be constant at 0.4% per year. Which of the following is closest to the expected principal prepayment this month?
选项：
A.USD 1,000
B.USD 7,000 C.USD 10,000 D.USD 70,000解释：
The expected principal prepayment is equal to: 20,000,000 × (1 – (1 – 0.004)^(1/12)) = USD 6,679.
prepayment principal不应该是按照等额本息计算出的每月应还的PMT*prepayment rate?
为什么用总贷款额**prepayment rate？
