How can one yield summarize a coupon bond priced off many different spot rates, and why must it be solved numerically?
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A coupon bond as a package of discount bonds
Write with each payment discounted at its own spot rate, in both the and forms, and list the cash flows of the three-year 5% $1,000 bond as the example.
Yield to maturity defined from the price
Write the equation that solves, state that practice runs from observed price to yield, and record the 30-year fixed mortgage rate as an average over the loan's life.
Solving for as a polynomial root
State that is a root of a degree- polynomial found numerically, record when a real root is guaranteed and when several appear, and note that a discount bond's YTM is its spot rate.