What does the Iran war mean for the stock market?


Thanks to tariffs, massive spending, and pressure on the Federal Reserve, the Trump administration has injected enormous uncertainty into global financial markets. But on February 28, the matter went one step further when the US and Israel started attacking Iran. Let’s see what this means for stocks Crude oil market.

There is some data on the stock market during wartime – including this study from The Motley Fool – but there is no clear link between military conflicts and stock market performance. While some economists credit World War II with helping to end the Great Depression and setting the stage for economic growth in the 1950s, investors should not expect military conflicts to have as large an impact (either positive or negative) on modern economies because systems are now more complex, and current wars are less widespread than World War II.

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A large-scale conflict, such as the Russian invasion of Ukraine that began in 2022, did not lead to a sustained decline in international reserves. In fact, d STOXX Europe 600an index that tracks the eurozone’s total equity, has risen more than 30% since the invasion.

Iranian flag with oil wells in the background.
Image source: Getty Images.

I expect a similar story to play out with the current Iran war, as the market focuses on things like consumer spending Cost of capital Productivity depends on artificial intelligence, which will have a very direct impact on corporate income in the next few years.

While the Iran war doesn’t currently look like a major downside risk to stocks and the economy, that could change if it expands into full-scale ground operations. According to a Brown University analysis, the 20-year “war on terror” after 9/11 has cost the US $8 trillion.

We don’t know how much the final war will cost, but rising US debt levels could undermine investor confidence in the dollar. Treasury bond Yields to Spike. If Treasury yields rise, This can increase the cost of capital throughout the economy and reduce the values ​​of growth stocks, as these companies often cannot finance their operations with internal cash flow.

The impact of the current war on oil markets is very clear. Iran is the world’s ninth-largest oil producer, with 3.99 million barrels per day in 2023 (4% of the total), and some of its oil facilities have already been attacked, along with facilities in neighboring countries. This reduces supply, which leads to higher prices. And Iran has closed the Strait of Hormuz, an important oil transit route, putting more pressure on oil supplies.

the price Brent Crude As I write this it is up almost 48% since the start of 2026.

^SG2A chart
^SG2A data by YCharts

That said, the United States is the world’s top oil producer (22% of the total in 2023), and that dramatically limits the impact of supply problems in other parts of the world. Rising oil prices will encourage US producers to increase their production. It will also increase the incentive to develop other resources in the Western Hemisphere, such as in Guyana and Venezuela.

And don’t forget, the White House has been encouraged to help increase the amount of oil on the market to avoid the chaos caused by what is happening in the Middle East. It makes sense to adopt a wait-and-see approach to the impact of the Iran war on equity and crude oil markets.

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What does the Iran war mean for the stock market? Originally published by Motley Fool

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