The big economic news last week was the inversion of the yield curve (i.e., when the yield on 10-year U.S. Treasuries dropped below the yields on shorter-term notes). This warrants—and will get, tomorrow—a more detailed discussion, but the short version of the story is that inversions can indeed signal trouble in the next six to eighteen months, but not right away. This is one more sign of weakness, and something to watch, but not a sign of imminent doom.