A single headline about Iran drove Wednesday's 0.95% decline, but the index moved as two markets at once rather than one. Oil prices jumped on the news, lifting energy stocks sharply, while the same escalation pushed Canadian bond yields higher on inflation concerns, dragging down materials and rate-sensitive technology and software names. That split pulled the composite lower even as one of its own sectors gained, erasing the index's advance since its mid-June record high.
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