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What would prove it wrong
If the S&P 500 or Nasdaq Composite close lower for two consecutive sessions following further earnings misses or escalation in Iran-linked rhetoric, the decoupling thesis fails and earnings or geopolitical risk is confirmed as repricing the index.
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Later publication

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A dated research thesis and its assessment. This is not portfolio performance or an investment recommendation.

US equity indices are decoupling from single-name earnings misses… · 9 July 2026 · Thesis ledger