medium · Debt Capital Markets credit-ratings-risk

Under the PSA (Public Securities Association) prepayment convention, what does '100% PSA' represent?

  1. The assumption that exactly 100 individual homes within the underlying pool are sold every single month.
  2. A constant 100% annual probability that each and every borrower in the pool refinances their mortgage.
  3. A prepayment rate fixed at precisely double the prevailing SOFR benchmark rate over the security's life.
  4. A CPR that starts at 0.20% in month 1 and increases by 0.20% each month until reaching 6.00% in month 30.

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