> ## Documentation Index > Fetch the complete documentation index at: https://docs.chicago.global/llms.txt > Use this file to discover all available pages before exploring further. # Duration > Understanding duration - a bond's sensitivity to changes in interest rates Duration measures how sensitive a bond's price is to changes in interest rates. The longer a bond's duration, the more its price moves when rates move, in both directions. ## Beginner ### What It Means When interest rates rise, existing bonds lose value, because new bonds now pay more. How much value an existing bond loses depends mostly on how far away its payments are: a bond maturing next year barely notices a rate move, while a bond paying out over thirty years feels it fully. Duration summarizes that sensitivity in a single number, the higher the duration, the bigger the price swing per unit of rate change. ### Example Consider two government bonds, one short-dated and one long-dated, when rates rise by the same amount. The short-dated bond's price dips slightly; the long-dated bond's price falls many times more. Same issuer, same rate move, the difference is duration. ### Why It Matters Duration is a key measure of a bond portfolio's sensitivity to interest rates. "Adding duration" means positioning to benefit if rates fall (and to lose if they rise); "reducing duration" means the reverse. Most of what a bond allocation decision controls is, in practice, its duration. *** ## Advanced ### How to Read It in the Reports The fixed income and tactical allocation sections speak of *duration posture*: whether the rates environment currently rewards holding longer-dated bonds. When a report says duration is being rewarded, it means yields have been falling (or are judged more likely to fall than rise), so rate-sensitive bonds are outperforming. "Punished" is the mirror image. The posture question, extend or shorten, is one of the standing dimensions of the bonds-versus-equities decision. ### Common Misreadings * **Treating duration as maturity**: they are related but not identical, duration reflects the timing of *all* a bond's payments, so a high-coupon bond has a shorter duration than a zero-coupon bond of the same maturity * **Assuming duration risk is always compensated**: the extra yield for extending duration varies with the [curve shape](/glossary/curve-shape); when the curve is flat or inverted, extending adds risk with little or no extra yield * **Reading duration as credit risk**: duration measures rate sensitivity; whether the borrower pays at all is a separate risk, which is why the reports treat the credit-versus-government choice as its own decision ### Duration as a Portfolio Statement For a cross-asset allocator, duration is also an equity hedge question: long-duration government bonds have historically cushioned equity drawdowns in some regimes and amplified losses in others, depending on why rates are moving. The reports' rates discussion frames which regime currently prevails. ### Related Terms The rates backdrop for duration Where the duration call lands Price-swing risk generally