medium · Principles of Finance

Why is it logically inconsistent to pair the current market yield of debt with the book value weight of debt in a WACC calculation?

  1. The market yield is always higher than the book weight, leading to a negative WACC.
  2. Book value weights only work when paired with the historical coupon rate.
  3. The current yield reflects today's risk and rate environment, whereas the book value reflects the environment at the time of issuance.
  4. Market yields are post-tax, but book weights are pre-tax.

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