An analysis of prevailing market conditions revealed the following yields: U.S. 90-day T-bill = 1.55%, U.S. 180-day T-bill = 1.75%, 5-year U.S. T-note = 2.25%, IBM common stock = 9%, IBM Aaa rated 30-year bond = 7.5%, and 10-year U.S. T-bond = 2.65%. Based on the above information, the shape of the yield curve for Treasury securities is