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Key rate shift: concept

The advantage of duration is convenience: a single measure summarizes the sensitivity of bond price to yield changes. The disadvantage of duration owes to the same thing: duration is a single-factor approach. As a (first-order derivative) linear approximation, it assumes a parallel shift in the yield curve. The key rate shift technique builds a set (vector) of key rates along the term structure; e.g., the one-year rate, the two-year rate. This is multi-factor: we can now model a more realistic shift in the term structure.
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