Definition
A line plotting the yields of U.S. Treasury securities against their maturities, from a few weeks out to 30 years. Normally it slopes upward, since lenders demand more to lock money up longer; it is flat when short and long yields are similar and inverted when short-term yields exceed long-term ones. Inversions have historically preceded recessions, though the timing varies.
Why it matters
The curve's shape sets the rates you actually live with: savings accounts and short CDs track the short end, while 30-year mortgage rates track the long end. An inverted curve is the unusual moment when a savings account can pay more than a long-term bond.