The U.S. yield curve inversion deepened on Tuesday to levels not seen since 2007, rekindling fears of a looming recession that spurred a sell-off on Wall Street and stoked even more safe-haven demand for government bonds. The intense interest in Treasuries supported demand for $40 billion worth of two-year government debt for sale, part of this week’s $113 billion fixed-rate Treasury supply. The yield curve often inverts prior to a U.S. recession.