- US stocks have defied all odds this year, and the market rally only strengthened in July.
- But the S&P 500 stumbled in early August, and strategy chief David Keller sees more downside ahead.
- Here are seven investments that Keller says can defy a market downturn.
After two months of nearly nonstop gains for the S&P 500, a long-time chartmaster warns that the weakness that markets displayed in early August is just the beginning.