• A humped yield curve occurs when medium-term interest rates are higher than both short-term and long-term rates.

  • The humpback curve is rare, but can result from a negative butterfly or an unparalleled shift in the yield curve, when long-term and short-term returns fall more than medium-term returns.
  • most often, yield curves have the lowest rates in the short term, steadily rising over time; while an inverted yield curve describes the opposite. The humpback curve is instead shaped like a bell.