Iran Conflict Unsettles Market Norms

Apr 15, 2026

The war has rattled stocks and shaken expectations about the usual market “rules.” Here’s what investors can learn from the episode.

Author
Lisa Shalett

Key Takeaways

  • Market upheaval in March showed that Treasury bonds do not always offer diversification in portfolios when stocks fall, as both dropped at the same time.
  • The episode also challenged the idea that the dollar is a predictable “safe haven,” as currency moves appeared unusually tied to oil.
  • Gold did not consistently behave like a classic shelter either, shedding value as it traded in line with riskier liquid assets.
  • Turbulence may continue: Consider staying diversified, invested and cautious, favoring active strategies where appropriate and adding diversifiers beyond core bonds.

Stocks rallied on news of an Iran ceasefire last week, but the bigger story for investors isn’t that bounce—it’s what the prior six weeks revealed about how markets behave when the focus switches from the “micro” to the “macro.”

 

Prior to the war, investors’ concerns about heavy tech spending, AI disruption and risks in private credit were creating a classic “micro” market, with money shifting across sectors, big performance gaps between stocks, and a premium on picking stocks rather than betting on a single macro call.

 

Then, war turned the market into something else: Oil spiked, interest rates moved higher, the outlook for Federal Reserve policy turned more hawkish, and growth risks rose. Very quickly, investors stopped trading companies and started trading one dominating macro issue: the energy shock.

 

What can investors learn from this episode, as markets lurched from micro drivers to macro panic—and now potentially back again, heading into the first-quarter corporate earnings season? 

  1. 1
    Markets are learning to absorb policy shocks

    During the tariff scare following “Liberation Day” in April 2025, equities fell about 20%. This time, however, even with a war and material global growth risks, the drawdown was tamer, around 9% at the worst moments. Part of that reflects the reality that markets have learned to anticipate reversals after aggressive policy threats. That is not complacency so much as adaptation.

  2. 2
    Bonds don’t always diversify stocks

    In the classic playbook, Treasury bonds stand firm when stocks fall. In March, that relationship broke down. With escalating tensions in the Middle East driving up oil prices and reviving inflation fears, bonds and stocks fell together, failing to provide diversification exactly when investors needed it most. The implication is simple: A portfolio that relies on a single relationship between assets that supposedly “always works” may be more vulnerable than it looks.

  3. 3
    The dollar didn’t act as a classic ‘haven’

    Normally, the dollar tends to strengthen when investors seek perceived safety or when U.S. rates look more attractive than rates abroad. However, for much of the first six weeks of the conflict, the greenback seemed unusually closely linked with oil, frequently rising with the commodity. And even after oil fell sharply following the ceasefire announcement, the dollar dropped more than many would have expected based on historical patterns.

  4. 4
    Gold wasn’t a shelter either

    Traditionally, gold is also viewed as a “safe haven” when stocks or other riskier assets fall. But this time, gold behaved more like a “risk-on” liquid asset, often falling alongside stocks, with many investors selling it to raise funds as financial conditions tightened. Of note, gold has become a larger part of foreign reserves—i.e., the asset pools that central banks hold to support financial stability and manage their currencies in a crisis. When gold becomes a bigger slice of those reserves, it can become a source of liquidity (meaning it can be sold to raise cash) during periods of stress.

  5. 5
    Asymmetric war can jolt markets quickly

    War is no longer being fought only with traditional ships, planes and large-scale firepower, meaning that the country with the strongest military cannot assume that it will win quickly and easily. The Russia-Ukraine conflict showed how long wars can drag on, and the Iran war underscored how low-cost drones and other asymmetric tools can still disrupt critical chokepoints like the Strait of Hormuz, with a rapid impact on global markets.

  6. 6
    The geopolitical map is shifting

    The U.S. looks increasingly alone in negotiations with NATO and Europe, while Russia and China appear to have gained advantages, and Iran may emerge newly empowered around the Strait in ways that could create economic rights and even new revenue streams. For markets, this is new territory, and it reinforces why caution is warranted.  

Portfolio Considerations

A ceasefire headline can spark a sharp bounce, but ongoing negotiations may bring more reversals and contradictory news, keeping trading conditions perilous.

 

Morgan Stanley’s Global Investment Committee recommends staying diversified, invested and cautious. Expect dispersion (i.e., the extent to which individual security returns vary within a market or sector) to remain high, which can favor active management, including hedge fund strategies for those for whom they are appropriate.

 

Finally, remember that a classic “60/40” portfolio can struggle when stocks and bonds become positively correlated, so investors may want to consider additional, thoughtfully sized sources of diversification.

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