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Negative Convexity

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Negative convexity
A bond characteristic such that the price appreciation will be less than the price depreciation for a large change in yield of a given number of basis points. For example, a fixed-rate mortgage may lose value as rates go down because of prepayments.

Negative Convexity
In callable bonds, a situation in which the principal is returned, either before maturity when interest rates are declining or after maturity when interest rates are rising. This exposes bondholders to the risk of realizing a lower return.


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They provide the positive duration and positive convexity needed to offset the negative duration and negative convexity of mortgage servicing, says Shaiman.
The early adoption election also provided Cadence an opportunity to decrease the duration of its security portfolio, reduce the negative convexity inherent in mortgage-backed securities and CMOs, improve cash flow predictability and increase our average yield on investment securities.
Convexity refers to the price/yield curve; negative convexity means that the price/yield curve flattens as interest rates decline).
 
 
 
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