Convexity

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DEFINITION of 'Convexity'

A measure of the curvature in the relationship between bond prices and bond yields that demonstrates how the duration of a bond changes as the interest rate changes. Convexity is used as a risk-management tool, and helps to measure and manage the amount of market risk to which a portfolio of bonds is exposed.

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INVESTOPEDIA EXPLAINS 'Convexity'

In the example above, Bond A has a higher convexity than Bond B, which means that all else being equal, Bond A will always have a higher price than Bond B as interest rates rise or fall.

As convexity increases, the systemic risk to which the portfolio is exposed increases. As convexity decreases, the exposure to market interest rates decreases and the bond portfolio can be considered hedged. In general, the higher the coupon rate, the lower the convexity (or market risk) of a bond. This is because market rates would have to increase greatly to surpass the coupon on the bond, meaning there is less risk to the investor.

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  2. How do I use the principles of convexity to compare bonds?

    Convexity, along with another principle known as duration, is an important consideration when assessing bond risk. All else ... Read Full Answer >>
  3. Where can I buy government bonds?

    The type of bond determines where you can purchase it, so you need to decide which type of bond you would like to purchase ... Read Full Answer >>
  4. Can a bond be traded over-the-counter?

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  5. Can a bond have a negative yield?

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