March Madness: How Is the War in Iran Affecting the Markets?

For a lot of people, March is supposed to be about brackets, buzzer-beaters, and the first real hint of spring. Instead, many investors are waking up to a different kind of scoreboard. Oil is lurching higher. Overseas markets are flashing red. The usual background noise of market commentary has been replaced by a more immediate question: what happens to your money when a geopolitical shock hits the global economy at the exact point where energy, inflation, and investor emotion all meet? That question feels especially personal when the headlines are this severe. As of March 9, 2026, crude prices had briefly surged close to $120 a barrel before pulling back, while major overseas stock indexes fell sharply as markets tried to process the economic fallout from the conflict that began on February 28, 2026 (AP, AP). When people ask whether the war in Iran is affecting the markets, the honest answer is yes. It already is. The more useful question is how, and what that should mean for long-term investors who do not want to confuse a serious short-term shock with a permanent change in their plan.

Why oil is at the center of the story

The fastest way a war involving Iran reaches financial markets is through energy. That is not a theory. It is simple geography mixed with global pricing. The Strait of Hormuz remains one of the most important energy chokepoints in the world, and the U.S. Energy Information Administration says that in the first half of 2025, about 20.9 million barrels per day moved through the strait, equal to roughly 20% of global petroleum liquids consumption. More than 20% of global LNG trade also passed through that corridor (EIA). That matters because markets do not wait for a full supply collapse before repricing risk. They move as soon as traders, refiners, shipping firms, insurers, and governments start asking what could happen next. A threatened route can be almost as disruptive as a closed one. Freight costs jump. Insurance premiums rise. Companies start searching for alternate routes or backup inventories. Buyers bid up near-term supply. In other words, oil can rise sharply before the worst-case scenario ever arrives. This is why war in a specific region can ripple far beyond that region. Even though the U.S. is less directly dependent on Persian Gulf imports than it used to be, oil is still priced in a global market. The EIA notes that only about 2% of U.S. petroleum liquids consumption was tied to crude and condensate imports moving through Hormuz in the first half of 2025, but that does not insulate American consumers from global pricing pressure (EIA). If the world has to pay more for oil, Americans usually feel some version of that at the pump, in shipping costs, in airline fares, and eventually in broader inflation readings. So when investors see oil spike, they are not just reacting to the energy sector. They are repricing the possibility that higher energy costs could squeeze household budgets, narrow corporate margins, and complicate central bank policy all at the same time.

From an energy shock to inflation anxiety

Before this conflict escalated, inflation had been cooling in a way that gave markets at least some breathing room. The Bureau of Labor Statistics reported that January 2026 CPI rose 0.2% month over month and 2.4% year over year (BLS CPI release). That was not a declaration of victory over inflation, but it did suggest the temperature was coming down. A sudden jump in oil changes the conversation quickly. Even if headline inflation had been easing, energy has a way of reintroducing anxiety because it touches so many parts of daily life. It is visible. People notice it right away. They may not have a strong opinion about industrial capacity utilization or the slope of the yield curve, but they notice what it costs to fill a tank, heat a home, or book a flight. That is one reason geopolitical shocks can carry an outsized emotional effect. They do not stay confined to one market screen. They move from futures contracts into family budgets. Once that starts, investors begin to ask whether central banks will have to stay cautious for longer, even if growth begins to soften. And growth was already showing signs of losing some momentum. The latest Employment Situation report showed that total nonfarm payrolls edged down by 92,000 in February 2026, while the unemployment rate held at 4.4% (BLS employment report). That does not, by itself, signal a recession. But it does remind us that this shock is arriving at a moment when the economy was not exactly powering ahead with effortless strength. That combination matters. Higher oil and a softer labor market is uncomfortable because it can push in opposite directions. Slower growth usually argues for easier policy. Higher energy-driven inflation argues for caution. Markets dislike that kind of tension because it narrows the range of easy answers.

Why markets rarely price war in a straight line

One of the hardest things for investors to live through is a market that does not move in a logical, tidy sequence. We like stories with clean lines. Oil goes up, so stocks go down. War intensifies, so safe havens rise. But in real time, markets are more chaotic than that. We are already seeing that. According to the Associated Press, Brent crude briefly surged to $119.50 on March 9 before falling back toward $105, while Japan’s Nikkei dropped more than 7% intraday before closing down 5.2% (AP, AP). That is not a market calmly digesting information. That is a market searching for footing. In periods like this, asset prices tend to reflect several competing forces at once. One force is fear of weaker economic growth. Another is fear of higher inflation. Another is simple liquidity stress, where investors sell what they can, not just what they want to. Another is sector rotation, with energy-related companies potentially benefiting while transportation, industrial users of fuel, and more rate-sensitive areas of the market feel pressure. This is also why investors can get whipsawed by headlines. A rumor about supply disruption can lift oil. A statement about strategic reserves or alternate routes can calm it. A single military escalation can drive a fresh wave of selling. Then a day later, markets can bounce because participants decide the worst case still is not the most likely case. None of that feels comfortable. But it is normal for geopolitical volatility. The bigger lesson is that markets are not just pricing today. They are pricing probabilities. How long might this last? How much supply will actually be interrupted? Will consumers retrench? Will companies absorb costs or pass them on? Will inflation expectations rise? No investor knows those answers with certainty in week one of a crisis. That uncertainty is exactly why volatility rises.

What this means for U.S. investors

For U.S. households, the direct and indirect effects are different. The direct effect is usually energy prices and the psychological impact that comes with them. The indirect effect runs through the stock market, interest rates, and business sentiment. Because the United States produces much more energy domestically than it did in earlier decades, this is not a copy-and-paste version of the 1970s. That is important. The American economy is not as structurally exposed to Persian Gulf crude as it once was. But lower exposure is not the same as no exposure. Global oil prices still matter. Consumer confidence still matters. Inflation expectations still matter. For investors, that means this kind of event tends to hit portfolios through correlation and sentiment before it shows up neatly in a quarterly statement. Broad stock indexes may fall even if many underlying businesses remain sound. Bond yields can move for competing reasons. Credit markets can tighten. Cash suddenly feels more emotionally attractive, even when moving too much of a portfolio into cash after a selloff may create a different kind of long-term risk. This is where planning matters more than prediction. In our earlier piece on Market volatility and your investments, we talked about the emotional challenge of watching your balance move around after years of saving. That challenge becomes sharper when the cause is not an earnings miss or a Fed speech, but an actual war. The instinct to “do something” can be powerful. The problem is that urgent feelings do not always lead to wise decisions. A geopolitical shock can absolutely justify a review of your risk exposure, liquidity needs, and upcoming spending plans. It does not automatically justify a wholesale rewrite of a sound long-term strategy.

The longer your time horizon, the more this perspective matters

Longer lifespans have changed the math of investing. Retirement is not a brief finish line for many families anymore. It can be a decades-long season of life. That means most investors need portfolios built to live through multiple business cycles, inflation scares, wars, policy shifts, and market panics, not portfolios designed for a perfect environment that never arrives. That is why this moment connects so directly to themes we have covered before. A resilient allocation is not one that avoids every decline. It is one that can absorb shocks without forcing bad decisions at the worst possible time. Our piece on Building a Portfolio That Can Weather Market Swings speaks directly to that reality. So does Longer lifespans, longer retirement, because a 25- or 30-year retirement almost certainly includes stretches like this. That longer-horizon view does not mean we should dismiss short-term pain. If you are within a few years of retirement, already drawing income, or sitting on a large near-term cash need, market volatility feels less abstract. Timing risk matters more. Sequence risk matters more. The path of returns matters more. In those cases, the right conversation is usually less about guessing whether oil will be at $90, $110, or $120 next week and more about whether your plan has enough flexibility built in right now. For some households, that may mean revisiting cash reserves. For others, it may mean reviewing how much short-term spending is exposed to equity volatility. For others, it may simply mean confirming that the portfolio they own still matches the life they are trying to fund. Those are planning questions, not prediction contests.

What disciplined investors should remember now

When war drives the market, the headlines invite us to think like traders even if our goals are not trading goals. Every hour brings a new quote, a new rumor, a new map, a new warning, a new theory about oil, inflation, and the Fed. That environment can make patience feel passive. It is not. In many cases, patience is active discipline. We think there are a few plain truths worth holding onto. First, a geopolitical shock is real, but the market’s first reaction is not always its final judgment. Second, the sectors that move first are not always the ones that matter most over the next three to five years. Third, the most durable investment decisions are usually tied to your need for the money, your capacity for risk, and your time horizon, not to the loudest headline of the week. That does not mean ignoring risk. It means responding to risk in a structured way. If your portfolio was built assuming that markets would always be calm, this is a useful stress test. If your plan already accounted for volatility, diversification, and the possibility of ugly surprises, this is exactly the kind of environment it was meant to withstand. The key takeaway is simple: the war involving Iran is affecting the markets primarily by pushing up energy prices, reviving inflation worries, and increasing volatility across risk assets. That is serious. But serious is not the same as unmanageable. For long-term investors, the goal is not to outguess every geopolitical turn. The goal is to make sure one frightening stretch of headlines does not derail a financial plan that was built for a much longer journey. Click the button below to schedule a time to chat.

Appendix: Sources

Associated Press: Crude oil prices spike near $120 a barrel as the Iran war impedes production and shipping U.S. Energy Information Administration: World Oil Transit Chokepoints Bureau of Labor Statistics: Consumer Price Index News Release, January 2026 Bureau of Labor Statistics: Employment Situation, February 2026