KEY POINTS
  • The S&P 500 hit another record high last week and is ahead by nearly 10 percent for the year, confirming its longer-term uptrend through August and now most of September — historically challenging months.
  • But heightened sensitivity to global market conditions and the valuation of equities compared with bonds are pressure points that could weigh on stocks in the fourth quarter or complicate the picture in early 2019.
  • The market during this economic cycle has not tolerated stocks much above this valuation with bond yields in the 3 percent area.

If the stock market were football, then entering the fourth quarter it would be the bulls' game to lose, with most of the pregame question marks about their stamina and halftime worries over roster depth answered assertively — in the form of a big lead and few obvious weaknesses.

The hit another record high last week and is ahead by nearly 10 percent for the year, confirming its longer-term uptrend through August and now most of September — historically challenging months. It was joined in record airspace by the Dow industrials, a sign that the trade frictions between the U.S. and China have been more a psychological weight than direct hit on equity values.