The main averages on Wall Street advanced on Monday, buoyed partially by a modest gain in U.S. Treasuries. Yields, which tend to move inversely to prices, fell by 1 - 3 basis points across the curve.

That’s why the 34-day shutdown in 2018 left barely a scar on growth metrics. If this round is capped by mid-November, the fourth quarter should still carry the semblance of normality. The labor data, ...