medium · Asset-Backed Securities asset-nuances

Compare the 'Negative Convexity' risk of an Agency MBS pool to a Prime Auto ABS pool during a period of rapidly falling interest rates.

  1. Agency MBS exhibits positive convexity because the government guarantee ensures bond prices appreciate more sharply than comparable Treasuries when rates fall.
  2. Both securitizations exhibit near-zero convexity since they are structured as fully amortizing assets with fixed, contractually scheduled principal repayment terms overall.
  3. Agency MBS has much higher negative convexity because mortgage prepayments are highly interest-rate sensitive, while auto prepayments are driven by vehicle trade-ins.
  4. Auto ABS exhibits higher negative convexity than agency MBS because auto loans carry much shorter stated maturities, mechanically causing a faster return of principal to investors.

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