David Rosenberg
David Rosenberg.
  • The Dow's recent winning streak is a worrying sign, David Rosenberg says.
  • The index was up 28% at this point in 1987, but virtually erased its gains by the year's end.
  • Rosenberg says a recession may be underway, and plunging inflation can be bad news for stocks.

The stock market's breathless climb should be a red flag to investors, and a recession may already be underway, David Rosenberg warned in a note to clients this week.

For the first time since January 1987, the Dow Jones Industrial Average closed in the green for 13 straight sessions before snapping its winning streak on Thursday.