Tariffs, Oil Shock, and US-Iran Tensions: Impact on the US Dollar, S&P 500, and Global Trade

The global economy is entering new era of uncertainty as geopolitical tensions and trade policies begin to collide. The United States economy has already given signs of weakness after the economy grew at slow rate in Q4 2025. At the same time the escalation of tensions between the United States, Israel and Iran has caused escalation of energy prices and disruption of global trade routes.

These developments come on top of tariff war that was started in 2025 and already strained international trade relations. The slower economic growth, rising energy costs and trade disruption are complex environment for financial markets. The markets are now watching very closely how these forces could shape currencies, equities, global trade flows and key industries over the next few weeks.

Tariffs and Slowing Growth Weigh on the US Economy

According to the latest data from Bureau of Economic Analysis, US economy expanded at 0.7% in Q4 2025, as shown in the chart below. This figure is way below the estimate of 1.4%. The downward revision represents weaker consumer spending, slower exports, reduced government spending and softer investment activity.

This chart below confirms this and shows that consumer spending in the United States increased to $16667 billion at a slower rate compared to Q3 2025.

The government spending also dropped to $3.96k billion in Q4 2025 as shown in the chart below.

These numbers show that the economy had already begun losing momentum before geopolitical tensions were exacerbated. This slowdown also follows aggressive tariff policy introduced by US government. In April 2025, the White House initiated a sweeping set of tariffs on a number of trading partners on Liberation Day. The goal was to reduce trade deficits and force new trade agreements.

However trade negotiations have produced limited progress. The United States has reached agreements with smaller economies but talks with major partners remain stalled. The situation became more complicated when US Supreme Court in February 2026 ruled that administration’s used emergency powers unconstitional to implement these tariffs. This decision created new uncertainty for global partners who had already adjusted their supply chain around these tariffs.

US-Iran Tensions Trigger Oil Shock and Inflation Risks

This situation was complicated when US and Israeli attacks on Iran in late February which led to greater instability in the Middle East. Iran retaliated by disrupting traffic through the Strait of Hormuz which is a strategic route that transports large share of world’s seaborne oil supply.

Oil prices responded immediately with WTI crude oil shooting to $119 before settling below $100. This was over 50% surge in oil prices in a short span of time. The surge in energy prices exerts inflationary pressure on global economy. The energy costs impact transportation, manufacturing and household spending.

Based on the development of geopolitical tensions, the oil prices are likely to surge in the near future which will result in a surge in inflation in Europe and the United States. This surge in inflation will force central banks to keep tighter monetary policy.

This is a serious environment because the global economy is already slowing down. Higher energy costs coupled with weaker growth can lead to a stagflation type environment that is not easy for policymakers to manage.

US Dollar Outlook: Volatility Rising in Currency Markets

Currency markets are responding to these developments with more volatility. The US dollar tends to strengthen during times of geopolitical tension because investors are looking to place their money in safe investment.

However, the situation now is more complicated. Slowing US growth could limit the US dollar rally if investors start to anticipate weaker economic performance. At the same time, higher energy prices may keep inflation higher which may preclude the Federal Reserve from lowering interest rates. This mixed environment could cause swings in major currency pairs.

The USDJPY pair may become extremely sensitive to world risk sentiment. During times of market stress, investors tend to shift their capital into the Japanese yen which is considered a traditional safe-haven currency. The daily chart for USDJPY shows that the pair has broken $159 on the strength of the US dollar which indicates a rally to short term target of $162.

The USDCHF pair follow similar dynamics. The Swiss franc tends to attract capital in times of geopolitical crisis. If tensions in the Middle East keep growing, both the yen and the franc can strengthen against the dollar in periods of market panic.

However, USDCHF was trading at an important long term support point of 0.77 before the start of US-Iran war. Therefore, the pair has initiated a strong rebound from this support on US dollar strength. The short-term resistance remains 0.8080 and a break above this level will open the door for further upside. On the other hand, a break below 0.77 will trigger a strong drop.

S&P 500 Outlook as Tariffs and Oil Prices Pressure Stocks

Equity markets do not perform well in a world of lower growth and higher energy costs. Higher oil prices raise operating costs for many companies and lower spending power of consumers as discussed above.

Therefore, the S&P 500 faces pressure as investors start to worry about economic slowdown. The rising geopolitical tensions will further add uncertainty to corporate earnings and global supply chains.

At the same time, the tariff war has already disturbed international trade flow. Many multinational businesses rely heavily on supply networks around the world. When tariffs make imports more expensive and geopolitical risks to shipping routes, corporate margins will be affected.

The weakness in US equity market is confirmed by technical perspectives in the chart below. The S&P 500 has broken support of the ascending broadening wedge pattern at 6,800 which suggests downside movement to 6,200. A break above 7,000 is required for the index to recover from this pressure.

Shipping Stocks React to Strait of Hormuz Disruption

One of the industries most affected by the conflict is the world shipping industry. A disruption to the Strait of Hormuz has immediate effects on the shipments of global energy and international trade.

Shipping companies incur increased insurance expenses and logistic difficulties as vessels avoid high-risk areas. Marine insurance premiums have already started to increase with insurers changing their risk assessments.

Maritime businesses engaged in global freight transport expect increased operational costs, as shipping routes become longer and more security requirements increase expenses. At the same time, freight rates may rise due to limited shipping capacity and supply disruptions.

These forces produce mixed results for shipping stocks. Some companies are buoyed by higher freight rates, while others are beset by higher costs and uncertainty of operation. The chart below shows that the A.P. Moller–Maersk, COSCO Shipping Holdings and Evergreen Marine have shown a positive price action after the US-Iran war started.

Airline Stocks Fall as Oil Prices Drive Fuel Costs Higher

Airlines are also the most sensitive industries when oil prices skyrocket. Jet fuel is one of the highest operating costs for airline companies. When price of oil increases rapidly, the margins in the airline industry decrease.

The conflict has already caused disruptions in airspace over parts of the Middle East. Several airlines have been compelled to reroute flights or suspend flights in affected regions. These changes add to fuel consumption and complexity of operation.

At the same time, geopolitical tensions are likely to decrease the demand for international travel. Tourists tend to avoid areas that are affected by conflict, which can reduce passenger volumes. The airline industry is consequently under pressure from both rising fuel prices and a possible decline in demand for travel.

The chart below shows that the top three airline stocks of the United States have remained in a downward trend during the past 30 days. This downward trend was intensified after the US and Israel strikes on Iran. American Airlines (AAL) feels the pressure more with a 25.75% decline while United Airlines (UAL) and Delta Airlines (DAL) dropped with 19.98% and 14.35%, respectively.

Aluminium Prices Rise as Supply Chains Face Disruption

The conflict will also disrupt the supply chains of key industrial materials. The Middle East is significant in the world’s aluminium production. Europe depends on the region for a large part of its aluminum supply.

If shipping routes remain unstable or energy prices are rising, the cost of aluminium production will increase. Aluminium is commonly used in the packaging, manufacturing and transportation industries.

Higher aluminium prices would likely feed into general industrial inflation and raise costs for many sectors of the global economy.

The technical analysis also supports this scenario as the price formed a base pattern from 2023 to 2025 and broke the key level of $2700 in September 2025. This breakout indicates a continued rally to $4061.55.

Global Market Outlook as Tariffs and War Risks Collide

The world economy is entering an era of increasing uncertainty. Trade tensions and geopolitical risks are now coming into play at the same time. The tariff war has already shaken confidence in world trade. Many companies had adjusted their supply chains because new tariffs increased costs and disrupted flow of international trade.

The recent court decision against tariff policy has added another layer of uncertainty as businesses are unsure how trade rules will develop. At the same time, tensions in the Middle East have caused energy prices to rise and have threatened supply disruptions. Higher oil prices are putting pressure on households and businesses worldwide by increasing transportation and production costs.

In my opinion, these conditions are long term issues and will likely push oil prices to higher levels which will result in higher inflation and slower economic growth. This environment will pose serious challenges to policymakers and financial markets. Therefore, central banks can have difficult time balancing need to control inflation with supporting economic activity. This will introduce strong volatility in currency markets and equity markets. The direction of the global economy in the coming months will depend greatly on the ebb and flow of geopolitical tensions and whether global trade relations stabilize.