By Gloria Ogbonna
When conflicts erupt between nations, the immediate concern is often military strategy or geopolitical consequences. But wars also carry enormous economic implications, many of which unfold quietly over time.
In the case of the current tensions involving the United States and Iran, economists warn that the greatest danger to the American economy may not come from an initial shock, but from the possibility of a prolonged conflict.
The famous political writer Randolph Bourne once observed that “war is the health of the state.” Yet from an economic perspective, war can resemble a disease that gradually weakens growth and productivity. A brief and clearly defined conflict can sometimes be absorbed by markets and industries. However, a drawn-out military campaign often produces long-term economic consequences that are far more difficult to reverse.
Why the Length of the War Matters
If a military conflict remains short and limited, financial markets and businesses can often adapt quickly. But when wars stretch over months or years, they begin to reshape the economy itself. Resources that would normally go toward innovation, infrastructure, and business expansion are instead redirected toward military operations and national security.
This shift can slow economic growth by diverting skilled workers, manufacturing capacity, and government funding away from the private economy. Over time, that diversion reduces investment in productivity-enhancing industries, which ultimately lowers the economy’s long-term growth potential.
Economists often describe this phenomenon as “crowding out,” where government spending in one area—such as defense—reduces resources available for other economic activity. When the conflict lasts long enough, the impact can create what some economists have called a period of “secular stagnation,” where economic growth slows for many years.
Oil Prices Are Only the First Signal
Whenever tensions rise in the Persian Gulf region, global markets tend to focus first on energy prices. Oil is often the most immediate indicator of geopolitical instability. If hostilities escalate around the Persian Gulf, crude oil prices can rise quickly, affecting transportation costs, manufacturing expenses, and household budgets.
Recent market movements have already reflected this sensitivity. As oil prices surged amid concerns about a prolonged war with Iran, stock markets showed increased volatility. When oil prices eased, equities rebounded.
But economists caution that oil prices are only the most visible effect. The deeper economic impact comes from how war redirects national resources.
Military operations require large amounts of labor, advanced technology, industrial production, intelligence networks, and logistical support. These resources must come from somewhere—and often they come from sectors that would otherwise contribute to long-term economic growth.
The Opportunity Cost of War
British economist John Maynard Keynes once summarized the economic dilemma of war in simple terms: every use of resources eliminates another possible use. When a nation devotes large portions of its workforce and industrial capacity to war production, those same resources cannot be used to produce consumer goods, infrastructure, or technological innovations.
In practical terms, that means the economy may appear busy and active during wartime, but it may actually be sacrificing future prosperity. Factories that might have produced new technologies or commercial products instead build military equipment. Engineers and scientists who might have worked on private-sector breakthroughs are redirected toward defense projects.
Economist Milton Friedman offered a related perspective, arguing that inflation is not an inevitable outcome of war—it depends largely on how the war is financed. Governments can fund military operations through taxes, borrowing, or monetary expansion.
However, even if inflation remains controlled, the underlying economic cost remains: resources have still been diverted from productive civilian uses.
The Economic Multiplier of War Spending
Research on government spending suggests that defense expenditures often produce smaller economic returns than many other forms of public investment. Economists measure this effect through what is known as a “multiplier,” which estimates how much economic output is generated for every dollar spent.
Studies by Robert Barro of Harvard University and economist Charles Redlick examined the economic impact of temporary increases in U.S. defense spending. Their findings suggest that the multiplier for military spending is significantly below one—meaning each dollar spent by the government produces less than a dollar of additional economic output.
This occurs because government defense spending often displaces private investment. Companies may delay expansion plans, entrepreneurs may postpone innovation, and financial capital may shift toward safer or government-backed activities.
Over time, this reduction in private investment can slow productivity growth and weaken future living standards.
Lessons from History
History offers many examples of how large-scale wars reshape economies. During World War II, the United States dramatically increased military production, transforming major parts of its industrial base into wartime manufacturing centers. At the peak of the war, nearly two-fifths of the nation’s total economic output was dedicated to military needs.
While this mobilization played a key role in defeating Axis powers, it also represented a massive reallocation of economic resources. Civilian production declined as factories were repurposed for aircraft, tanks, and other military equipment.
A similar pattern occurred during World War I, when governments redirected labor and industrial capacity toward wartime production.
Modern economies are even more complex and specialized than those of earlier eras, meaning the process of repurposing industries can create significant disruptions and bottlenecks.
The Long Shadow of Modern Wars
The economic consequences of prolonged conflict are not limited to direct military spending. In many cases, the largest costs appear years later through slower productivity growth, reduced investment, and long-term government obligations.
For example, the financial burden of the Iraq War extended far beyond the battlefield. Research from the Costs of War project at Brown University estimated that the total long-term cost of the war—including veterans’ care and interest on borrowed funds—could exceed $2.8 trillion.
Yet economists argue that the indirect economic consequences may be even more significant. Long wars can create a climate of uncertainty that discourages business investment and encourages short-term thinking in both the public and private sectors.
This environment can contribute to slower economic growth and declining productivity, trends that became visible in the years following the Iraq conflict.
The Risk of Mission Creep
Another factor that often prolongs conflicts is what policymakers call “mission creep”—the gradual expansion of military objectives over time. Initial goals may be narrowly defined, but additional responsibilities can accumulate as conditions evolve.
Military planners may begin with a limited objective, such as disabling nuclear facilities or deterring aggression. However, new goals often emerge: protecting shipping routes, stabilizing regional allies, countering proxy forces, or rebuilding damaged infrastructure.
Each new objective increases the duration and complexity of the conflict, making it harder for the economy to return to normal.
A Short War vs. a Long War
If the confrontation with Iran remains limited and clearly defined, economists believe the U.S. economy could absorb the shock. Markets would likely adjust, energy prices could stabilize, and businesses could resume normal investment patterns.
However, if the conflict turns into a prolonged geopolitical struggle, the consequences could become structural rather than temporary. Long-term war spending could weaken private investment, reduce productivity growth, and reshape the American economy in ways that persist for years.
Ultimately, the true economic danger of war is not always the initial disruption. It is the slow and steady shift of resources away from growth and innovation toward sustaining a prolonged conflict.
A brief war may leave scars. A long war can change the trajectory of an entire economy.
Source: Breitbart
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