Bull Steepener
A change in the yield curve caused by short-term rates falling faster than long-term rates, resulting in a higher spread between the two rates.
Investopedia Commentary
A steepener differs from a flattener in that a steepener widens the yield curve while a flattener causes long-term and short-term rates to move closer together. When the yield curve is said to be a bull steepener it means that the higher spread is caused by the short-term rates, not long-term rates.
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See also: 30-Year Treasury, Bear Flattener, Bear Steepener, Bull Flattener, Treasury Note, Yield Curve