零息利率（zero-coupon interest rate或zero rate，又称即期利率——spot rate），指从当前时点开始至未来某一时点止的利率，有时也称零息债券收益率（Zero-coupon yield）。
如果经济能持续改善，那么美联储可能在今年晚些时候不再“继续延长”零利率政策，从而为2012年的升息打下基础。
If the economy continues to improve, the Fed would probably lay the groundwork for higher rates in 2012 by dropping its "extended period" commitment later this year.
例如，无论你是制作者或是使用者，要是你知道一个零票息债券10年内到期，你会如何利用隐含利率去计算出每期间的利息支出呢？
For example, as a preparer or user, knowing that a zero-coupon bond matures in 10 years, how do you use the implicit interest rate to compute the periodic interest expense?
利率期限结构描述了不同期限零息债券的收益率及其与到期期限之间关系。
The term structure of interest rates describes the relationships between the yields of zero coupon bonds and their terms to maturity.
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