Muni-Bond Yield Curve Flattest Since 2008 Credit Crisis: Chart

The difference between short- and long-term yields in the $3.7 trillion municipal-bond market is the smallest in more than eight years. With tax-exempt mutual funds flush with cash from the longest stretch of inflows in six years, managers have poured money into higher-yielding securities, pushing up the price. By the end of last week, that left 30-year yields just 1.75 percentage points more than those on 2-year securities, the smallest since January 2008, when the credit-market crisis was building. That difference, known as the yield curve, shows that investors are receiving little compensation for the risk of owning securities that don’t mature for decades.