medium · Asset-Backed Securities

How does the WAL of an Interest-Only (IO) strip behave when PSA speeds increase?

  1. The WAL remains constant as interest is paid on a notional balance.
  2. The WAL extends and total cash flows increase.
  3. The WAL shortens, but total cash flows increase due to higher reinvestment rates.
  4. The WAL shortens and total cash flows decrease.

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