hard · Asset-Backed Securities

Why does an Interest-Only (IO) strip have 'negative duration' in many interest rate scenarios?

  1. Because IO strips are typically issued as floating-rate notes with LIBOR caps
  2. It reflects the 'burnout' effect of the underlying mortgage pool
  3. When interest rates fall, prepayments accelerate, reducing the total interest cash flows and causing the bond price to drop
  4. When interest rates rise, the discount factor increases more than the coupon income

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