Why is an assumed prepayment speed necessary to project the cash flow of a pass-through?

What will be an ideal response?


To value a pass-through security, it is necessary to project its cash flow. The difficulty is that the cash flow is unknown because of prepayments. The only way to project a cash flow is to make some assumption about the prepayment rate over the life of the underlying mortgage pool. The prepayment rate assumed is called the prepayment speedor, simply, speed. If the assumed prepayment rate is inaccurate or misleading, the resulting cash flow is not meaningful for valuing pass-throughs.

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