Is the U.S. Dollar Breaking? How the Iran War, Rising Oil Prices, Expensive Borrowing and $353 Trillion of Global Debt Are Testing the World’s Financial System

 

Introduction-Wall Street may be celebrating. Bond markets are warning.

• Six months into the United States’ war with Iran, the battlefield is no longer confined to West Asia. It has expanded into something far less visible but potentially more consequential: "the global financial system."
• Look at Wall Street, and the picture can appear surprisingly reassuring. The U.S. stock market has just snapped a brutal three-day losing streak. Technology companies are benefiting from an extraordinary artificial-intelligence boom, with giants such as Nvidia and Dell attracting investors and generating optimism.
• But beneath those green numbers, another market is sending a very different message.
• And that raises a bigger question: Is the problem really the U.S. dollar—or is it the rising cost of sustaining the financial system built around it?
• The answer lies in a chain reaction that begins with war, runs through oil and inflation, reaches interest rates and Treasury yields, and ultimately lands on governments, businesses and households across the world.

The global bond market is under pressure.

• And that matters because bonds determine the cost of borrowing for governments, companies and households across much of the world.
• The question, therefore, is not simply whether the U.S. dollar is about to collapse. It is whether the economic foundations supporting the dollar-centric financial system are becoming increasingly expensive—and increasingly difficult—to sustain.

The oil shock is not just an oil shock

• The first link in this chain is oil.
• The escalation of fighting between the United States and Iran has pushed oil prices back toward the psychologically important level of $100 a barrel. Brent crude, the global benchmark, surged more than 4% during the week described in the reports, although prices have since shown some stability.
• For ordinary consumers, expensive oil may initially look like a petrol-price problem, but it is much bigger than that.

1. Oil is embedded in the infrastructure of the global economy. 
2. Ships require fuel. 
3. Aircraft require fuel. 
4. Trucks require fuel. 
5. Factories consume energy. 
6. Goods have to be transported from producers to consumers.

• Therefore, when oil prices rise, the shock travels through the economy:

• An oil shock does not automatically translate one-for-one into headline inflation; the eventual impact depends on the size and duration of the price increase, energy intensity, exchange rates, subsidies and how businesses pass costs through to consumers
• That creates precisely the problem central banks do not want: "renewed inflationary pressure."

The Federal Reserve's dilemma

• This puts the U.S. Federal Reserve in an uncomfortable position.
• The Fed's long-term inflation objective is around 2%. But if an energy shock keeps inflation elevated, policymakers cannot simply return to an era of ultra-cheap money.
• That means interest rates can remain higher for longer, and that affects much more than Wall Street.
• Higher interest rates mean-

1. more expensive mortgages, car loans, credit cards and business financing. 
2. Companies may postpone factory expansions because the cost of capital is too high. 
3. Families may find home ownership increasingly difficult. 
4. Businesses may cut investment because borrowing no longer makes economic sense.

• In other words, the cost of geopolitical conflict can eventually reach the household budget.

Why the 10-year U.S. Treasury matters to everyone

• This is where the 10-year U.S. Treasury yield becomes crucial.
• The U.S. Treasury market is generally regarded as the benchmark for global dollar-denominated borrowing because U.S. government debt is viewed as one of the world's safest and most liquid major assets.
• The 10-year Treasury yield has been hovering around 4.8% in the scenario described in the two recordings, approaching the psychologically important 5% level.
• Why should someone outside the United States care? Because Treasury yields influence the global price of money.
• If investors can lend to the U.S. government—the world's largest economy and traditionally one of the safest borrowers—at nearly 4.8%, other borrowers generally have to offer more to compensate investors for taking additional risk. That includes corporations, banks, emerging-market governments and households.
• Thus, a rise in U.S. Treasury yields can transmit tighter financial conditions far beyond America's borders.

America's debt problem existed before the war.

• But there is an important distinction- the Iran war did not create America's debt problem, but it intensified an existing vulnerability.

• The United States is carrying an enormous government debt burden—described in the source material as approaching approximately $40 trillion at the time of writing. Washington must continually finance existing obligations while also funding government spending, including defense and the costs associated with war.
• When debt is already enormous, higher interest rates become particularly painful. A government that has to borrow repeatedly is increasingly exposed to the cost of refinancing that debt. Investors may still be willing to lend, but they can demand higher returns when they perceive greater inflation, fiscal or geopolitical risks.
• The message from markets is therefore not necessarily, “We will stop lending to America.” It can instead be: “We will continue lending—but you must pay us more.” That distinction is critical.

And this is not only an American problem.

• The same phenomenon is appearing elsewhere.
• Every government collects revenue—primarily through taxation and other sources—and spends that money on public services, infrastructure, subsidies, defense and other obligations.
• "When spending exceeds revenue, governments borrow", though government debt is different from an ordinary household or bank loan because government bonds themselves are "financial assets." Pension funds, banks, insurance companies, central banks, sovereign wealth funds and other major investors hold government securities as part of their portfolios.
• They are generally considered "relatively safe investments," although no government bond is completely risk-free;  increasingly, investors are demanding higher returns from several major economies.
• The figures cited in the source material are striking:

1. United States: the 10-year government borrowing cost approached 4.8%, described as a roughly 20-month high.
2. Japan: the 10-year government borrowing cost reached around 3%.
3. United Kingdom: borrowing costs crossed 5.2%, described as the highest level since June 2008.

• The British number is particularly striking because June 2008 immediately preceded the global financial crisis that erupted with extraordinary force later that year.
• The comparison does not mean that today's situation is identical to 2008; rather, it illustrates how dramatically borrowing conditions have changed.
• In simple terms, investors are demanding a higher return because the overall conditions surrounding that government’s debt have changed. The crucial question is not simply whether investors are losing trust, but why the required return is rising?—and how long that higher cost of borrowing can be sustained.

Why inflation makes governments more expensive borrowers

• The connection between oil, inflation and government bonds is often overlooked
• Suppose an investor agrees to lend money to a government for ten years.
• If inflation rises significantly during those ten years, the money returned to the investor will have less purchasing power. Investors may therefore demand compensation for that inflation risk. Higher inflation expectations can push interest rates higher, but they are only one part of the equation. 
• Expectations for monetary policy, economic growth, government borrowing, investor demand, fiscal conditions and geopolitical risk can also influence bond yields.
• This creates a chain reaction as shown in the following infographics-

     

• And when the largest economies of the world face this pressure simultaneously, the consequences become global.

The bigger problem: $353 trillion of debt

• Yet even this explanation is incomplete because the world was already heavily indebted before the latest geopolitical shock.
• Global debt across sectors—including households, businesses and governments—not government debt alone, has climbed to approximately $353 trillion, according to the figure cited in the recordings for March this year.
• That number includes household, corporate and government borrowing, with government debt representing a substantial portion.
• Much of the debt accumulation accelerated after the COVID-19 pandemic. When economies shut down, businesses stopped operating normally, people reduced spending, and governments collected less tax revenue, but governments could not simply stop spending. They had to support households, businesses, health systems and economies during an unprecedented disruption.
• So governments borrowed. The extraordinary part is what happened afterwards. The borrowing did not fully reverse when the pandemic ended.
• Debt accumulated during the emergency became part of the structural financial landscape.
• The Iran war has therefore not created the mountain of global debt, but has made that mountain more expensive to carry.

The dollar is not necessarily “broken”—but confidence matters.

• This brings us back to the central question: "Is the U.S. dollar broken?"
• Not necessarily. A rising Treasury yield is not evidence by itself that the dollar is collapsing. Higher yields can reflect many factors, including-

1. inflation expectations, 
2. economic growth, 
3. monetary policy, 
4. fiscal conditions, and 
5. investor demand.

• Nor does a temporary decline in bond prices mean that the world has suddenly abandoned the dollar.
• The dollar's importance, however, goes far beyond its role as America's currency. It is deeply embedded in international trade, commodity markets and global finance. Oil, for example, is predominantly traded and invoiced in U.S. dollars, while banks, corporations and governments around the world routinely use dollar-based financial markets to conduct and finance international transactions.
• In light of the above scenario, the more important issue is confidence, as the dollar's international role depends not merely on the existence of American currency. It rests on confidence in U.S. financial markets, Treasury securities, institutions, liquidity and America's capacity to meet its obligations.
• If investors increasingly demand a premium to hold U.S. debt, the system becomes more expensive to maintain.
• And if Washington simultaneously increases military spending, faces enormous existing debt obligations and confronts higher energy prices, its room for fiscal manoeuvre becomes narrower.

Sanctions could add another layer of uncertainty.

• The geopolitical dimension makes the situation even more complicated.
• Washington has threatened additional sanctions against Iran, including potential sanctions involving banks. The United States has also emphasized support from allies and partners, including the European Union, European Central Bank, United Kingdom, United Arab Emirates and Bahrain.
• If additional sanctions disrupt energy markets, financial channels or international trade, they could generate another round of uncertainty.
• For investors, uncertainty itself has a price, and the consequences would not necessarily stop at America's borders.

The bill ultimately reaches ordinary people.

• This is why Treasury yields should not be dismissed as abstract numbers discussed by Wall Street traders.
• A higher cost of government borrowing can eventually influence the cost of capital throughout an economy.

1. For a company, it could mean postponing a new factory.
2. For a developing country, it could mean a much heavier debt-service burden.
3. For a family, it could mean that a mortgage becomes unaffordable.
4. For an investor, it could mean that inflation erodes real returns.
5. For governments already carrying substantial debt, it could mean that an increasing share of public revenue is required simply to service existing obligations.

• The spectacular rise of artificial intelligence and soaring technology stocks may temporarily distract markets from these pressures, but technological optimism cannot permanently eliminate the cost of capital.

We can conclude: the real warning from today's markets.

• The most important message, therefore, is not that the dollar is about to collapse.
• It is that the era of extraordinarily cheap capital is becoming increasingly difficult to sustain.
• The world entered the post-pandemic period with an enormous debt burden. Geopolitical conflict is now adding energy shocks, fiscal pressures and uncertainty to that already fragile environment.
• The United States sits at the centre of this system because the dollar remains the world's dominant reserve and transaction currency and U.S. Treasury securities remain foundational to global finance.
• That gives Washington extraordinary advantages—but it also means that changes in U.S. borrowing costs have consequences everywhere.
• The battlefield may be in West Asia. The economic shock, however, can travel through oil tankers, Treasury markets, currencies, banks, factories and household budgets across the planet.
• The dollar may not be “broken", but the global financial system built around it is being asked to carry an increasingly heavy load.
• And when the safest borrower in the world has to pay substantially more to borrow, every other borrower should pay attention.
• Because the ultimate bill for expensive money does not remain in  Washington, but it arrives at the doorstep of the entire global economy.

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