The World Has Not Seen Tariffs This High in Nearly a Century
The average effective tariff rate on goods entering the United States reached 10.3% in January 2026, a level not seen since 1947, according to the Penn Wharton Budget Model. For context, the rate stood at just 2.4% in 2024. In barely twelve months, American trade policy has undergone the most dramatic transformation since the Smoot-Hawley Tariff Act plunged the global economy deeper into the Great Depression.
The consequences are already visible. Factory employment in the United States is declining. Consumer prices are rising faster than central banks expected. And more than 3,000 new trade and industrial policy measures were introduced globally in 2025 alone, three times the annual level recorded a decade earlier, according to the World Economic Forum. Global trade did not collapse, but it was profoundly reshaped.
This article explains what happened, why it matters, and what the economic science behind tariffs, quotas, and trade barriers tells us about where this is heading.
A Timeline of the Trade War
The pace of trade policy changes in 2025 and 2026 has been extraordinary. Below is a timeline of the key events that brought the global economy to this point.
Table 1: Key Events in the 2025–2026 Global Tariff War
| Date | Event | Significance |
|---|---|---|
| Feb 2025 | IEEPA tariffs imposed on Canada, Mexico, and China | Marked the start of sweeping executive tariff action using emergency powers |
| Apr 2, 2025 | “Liberation Day”, reciprocal tariffs announced on 50+ countries | Effective tariff rate surged to 16%; highest since the 1930s at peak |
| Apr 9, 2025 | 90-day pause on non-retaliating countries; 10% blanket tariff remains | Created two-tier system: retaliators (China) vs. negotiators |
| May 2025 | US-UK and US-China partial trade deals announced | China tariffs reduced from 145% to 30% for 90 days |
| Jul – Dec 2025 | Agreements on Reciprocal Trade (ARTs) signed with 20+ countries | Argentina, Indonesia, Taiwan, and others struck bilateral deals |
| Feb 20, 2026 | Supreme Court strikes down IEEPA tariffs (6-3 ruling) | Court ruled IEEPA does not authorise tariffs; $130 billion in refunds triggered |
| Feb 24, 2026 | 10% Section 122 tariff imposed on all imports | New legal authority invoked; rate announced to rise to 15%; 150-day time limit |
| Mar 11, 2026 | Section 301 investigations launched into 16+ trading partners | EU, China, Mexico, Japan, India, and others targeted for “structural excess capacity” |
| Mar 26, 2026 | EU Parliament advances US-EU Turnberry Agreement | EU agreed to remove all tariffs on US industrial products in exchange for a 15% levy |
|
||
The scale and speed of these policy shifts are historically unprecedented. The Tax Foundation estimates that the tariffs enacted represent the largest US tax increase as a percentage of GDP since 1993.
Why Tariffs Are Back After 80 Years of Decline
To understand where we are, it helps to know where we came from. After the catastrophe of the Smoot-Hawley Tariff Act in 1930, which raised average tariffs to nearly 20% and is widely credited with deepening the Great Depression, the United States spent the next eight decades systematically dismantling trade barriers.
The Reciprocal Trade Agreements Act of 1934 gave the president authority to negotiate bilateral tariff reductions. The General Agreement on Tariffs and Trade (GATT) in 1947 extended this logic to the multilateral level. By the time the World Trade Organization was established in 1995, the average effective US tariff rate had fallen below 5%. By 2024, it was 2.4%.
The reversal began with a combination of economic and political forces: persistent US trade deficits (exceeding $900 billion annually), the loss of manufacturing jobs to lower-cost producers (particularly China), voter backlash in industrial regions, and a bipartisan shift toward skepticism of free trade. The result has been a return to the tariff levels that economists thought were permanently behind us.
How Tariffs Are Hitting Prices and Markets
The most immediate effect of tariffs is higher prices. Tariffs are, in their simplest form, a tax on imported goods. The Tax Foundation estimates that the current tariff regime amounts to an average tax increase of $1,500 per US household in 2026. The Yale Budget Lab puts the figure higher, at $2,800 in the short run, once all tariff regimes are accounted for.
The pass-through to consumers has been slower than in previous tariff episodes but is still substantial. Research cited by the Stanford Institute for Economic Policy Research suggests that more than 50% of tariff costs are now being passed to consumers, compared with the near-100% pass-through observed under the first Trump administration tariffs.
The chart below shows how today’s effective tariff rate compares to historical US tariff levels across key periods in American economic history.
Source: Data compiled from Tax Foundation, Penn Wharton Budget Model, and US International Trade Commission. Chart shows weighted average effective tariff rate on all US imports during selected periods.
Beyond consumer prices, financial markets have been volatile. The S&P 500 experienced sharp swings with every tariff announcement, pause, and reversal throughout 2025. The uncertainty itself has become a drag on business investment, as companies struggle to plan around a policy environment that changes on a near-weekly basis.
The price elasticity of demand varies enormously across goods. For products like steel and aluminium, where domestic alternatives exist (albeit at a higher cost), tariffs shift demand toward domestic producers. For products like semiconductors and rare earth minerals, where substitution is extremely difficult, the tariff is absorbed almost entirely as a higher price.
Policy Response
The most dramatic policy development of 2026 was the Supreme Court ruling on February 20 that struck down the use of the International Emergency Economic Powers Act (IEEPA) to impose tariffs. In a 6-3 decision, the Court ruled that IEEPA, a law originally designed for financial sanctions during national emergencies, does not authorise tariffs on imported goods.
The ruling immediately invalidated the tariff framework that had been in place for most of 2025. The administration responded within hours by invoking Section 122 of the Trade Act of 1974, which allows the president to impose tariffs of up to 15% for 150 days to address “fundamental international payments problems.” A blanket 10% tariff was imposed on February 24, with the president announcing it would rise to 15%.
The ruling also triggered an estimated $130 billion in tariff refunds to US businesses that had paid duties under IEEPA. More than 2,000 companies, including Costco and FedEx, filed lawsuits seeking compensation. The US Customs agency announced a four-step electronic process for importers to file refund claims.
Simultaneously, the Office of the US Trade Representative launched new Section 301 investigations into more than 60 countries. Section 301, a more established legal tool, allows tariffs to be imposed after a formal investigation into “unfair trading practices,” but the process typically takes months, not days.
How the World Is Adapting
The global response to US tariffs has followed a pattern seen in every major trade conflict: adaptation, diversion, and negotiation.
Trade diversion, when trade flows shift from the tariff-imposing country to third-party routes, has been the most significant response. A McKinsey Global Institute report published in March 2026 found that while US imports from China dropped significantly, imports from Vietnam, India, Taiwan, and Mexico surged to fill the gap. China’s overall trade surplus still reached a record high, as Chinese firms pivoted to selling industrial components and capital goods to emerging economies.
The free trade agreement landscape has also been reshaped. The landmark EU-India free trade deal, reached in January 2026 after 20 years of negotiations, created the world’s largest free trade zone encompassing two billion people and nearly 25% of global GDP. Restrictive US trade policy effectively pushed other countries closer together.
At the firm level, nearly three in four business leaders now prioritise resilience investments over pure efficiency, according to the World Economic Forum’s Global Value Chains Outlook 2026. Companies are building “adaptive networks” that can be reconfigured as tariff regimes change, a structural shift that may permanently increase the cost of goods even if tariffs are eventually lowered.
Who Pays
The costs of the tariff war are not borne equally. Certain industries, regions, and demographics are disproportionately affected.
Table 2: Tariff Rates by Major Trading Partner and Product Category (January 2026)
| Category | Effective Tariff Rate | Key Impact |
|---|---|---|
| China (overall) | 33.9% | Highest rate among major partners; decoupling accelerating |
| Steel & Aluminium | 41.1% | Highest product-category rate; Section 232 tariffs compounding |
| Automobiles | 14.9% | 25% Section 232 tariff on imported vehicles; parts tariff expanding |
| Canada & Mexico (USMCA) | <5% | 85% of imports now claiming USMCA exemption |
| European Union | 10–15% | Turnberry Agreement under ratification; uncertainty persists |
|
|
||
Source: Penn Wharton Budget Model, USITC DataWeb, March 2026.
In the United States, the tariff war has produced a paradox. The trade deficit has declined for ten consecutive months, a stated policy goal, but factory employment has also fallen. Inflation is running above the Federal Reserve’s 2% target. US gasoline retail prices have climbed sharply, compounded by the Middle East conflict. The average American household is paying more for cars, appliances, electronics, and food, while the labour market has weakened to the point where monthly job growth averages just 17,000, a rate that would have signalled crisis in earlier eras but may simply reflect dramatically reduced immigration flows.
In the United Kingdom, the US-UK trade deal has provided partial relief, keeping tariffs at 10% on most goods and securing a preferential rate on the first 100,000 imported UK automobiles. However, UK manufacturers that rely on global value chains passing through China face indirect cost increases.
In Canada, the USMCA exemption has been a lifeline. Nearly 85% of Canadian exports to the US now qualify for duty-free treatment under the agreement. However, uncertainty over the trade relationship has dampened business investment, and the Canadian dollar has weakened against the US dollar.
In developing economies, the picture is mixed. Countries like Vietnam, India, and Bangladesh have benefited from trade diversion, absorbing manufacturing orders that previously went to China. But the broader uncertainty has reduced foreign direct investment flows and increased the cost of imported capital goods, slowing industrialisation.
Trade as Strategy
The tariff war is not purely an economic phenomenon. It is deeply intertwined with geopolitical competition, particularly between the United States and China.
China’s response to US tariffs has been strategic rather than purely retaliatory. While China imposed counter-tariffs, its more consequential moves have been in trade diplomacy: expanding exports to emerging markets, cutting consumer goods prices by an average of 8% to maintain market share, and leveraging its dominance in critical minerals as a bargaining chip. Goldman Sachs expects China’s current account surplus to rise to 4.1% of GDP in 2026, partly because trade barriers have proven less effective at constraining China’s exports than anticipated.
The European Union finds itself caught between two forces: US tariff pressure and Chinese industrial competition. Germany, whose largest trading partner is now China (with $296 billion in bilateral trade), has pursued a diplomatic reset with Beijing even as EU institutions negotiate trade deals with Washington. This tension between Atlantic and Pacific economic relationships will define European trade policy for years to come.
In game-theoretic terms, a framework explored in depth in MASEconomics’ article on the Nash Equilibrium, the tariff war represents a classic prisoner’s dilemma: each country has an individual incentive to impose tariffs, but the collective outcome when all countries do so is worse for everyone.
Macroeconomic Outlook
Major forecasters have revised their global growth and inflation projections significantly in response to the tariff war and the concurrent Middle East energy crisis.
Table 3: Macroeconomic Projections for 2026: Selected Economies
| Economy | GDP Growth (2026) | Inflation (2026) | Source |
|---|---|---|---|
| United States | 2.8% | ~3.0% | Goldman Sachs Research |
| Euro Area | 1.3% | ~2.0% | Goldman Sachs Research |
| China | 4.5% | ~1.0% | IMF WEO January 2026 |
| United Kingdom | 1.0% | ~2.5% | Oxford Economics |
| Global | 3.3% | Declining (uneven) | IMF WEO January 2026 |
|
|
|||
Sources: Goldman Sachs Research, IMF World Economic Outlook (January 2026), Oxford Economics.
The key risk, identified by nearly all forecasters, is a scenario in which tariff escalation coincides with prolonged energy disruption from the Middle East conflict. This would produce a combination of rising inflation and slowing growth, the condition economists call stagflation, that is exceptionally difficult for central banks to manage, as we explained in our analysis of the Strait of Hormuz crisis.
Table 4: Tariff War Scenarios: What Could Happen Next
| Scenario | Trigger | Impact on US GDP | Impact on Inflation |
|---|---|---|---|
| Section 122 tariffs expire (Base Case) | 150-day time limit; no replacement legislation | -0.1% to -0.2% long-run | Modest; fading tariff impact |
| Section 301 tariffs replace IEEPA (Moderate) | Investigations conclude; new targeted tariffs enacted | -0.3% to -0.5% long-run | Core PCE stays near 3% |
| Full trade war escalation (Severe) | Congressional legislation; broad retaliation | -0.8% to -1.2% long-run | Risk of above 4% CPI |
| Grand bargain / De-escalation (Upside) | Comprehensive deals with EU, China, and others | +0.3% to +0.5% boost | Return to 2% target |
|
|
|||
Source: Compiled from Yale Budget Lab, Tax Foundation, and Goldman Sachs Research scenario analysis.
A Structural Shift in Global Trade
Even if tariffs are reduced tomorrow, the trade war has already triggered structural changes that will shape the global economy for a decade or more.
The end of hyper-efficiency. For 30 years, the dominant model of globalisation prioritised efficiency above all else: produce where costs are lowest, ship globally, and optimise for just-in-time delivery. The tariff war, combined with COVID-era disruptions and energy crises, has forced a permanent recalibration. Companies are now building redundancy into their supply chains, even though it raises costs. The global value chain is not disappearing, but it is being redesigned around resilience rather than pure cost minimisation.
The splintering of trade blocs. The multilateral trading system built on the WTO’s “most favoured nation” principle is being replaced by a patchwork of bilateral and regional deals. The EU-India agreement, the expanding network of US Agreements on Reciprocal Trade, and China’s deepening commercial ties with ASEAN and Africa all represent a world where economic integration is selective rather than universal.
The return of industrial policy. Tariffs are just one tool in a broader revival of government-directed economic strategy. Semiconductor subsidies, AI investment mandates, critical minerals stockpiling, and reshoring incentives are all part of a policy environment where the boundary between trade policy and industrial policy has effectively dissolved.
MASEconomics Explains
Four economic concepts you need to understand the tariff war
Tariffs and Deadweight Loss
A tariff is a tax on imported goods. While it raises government revenue and can protect domestic producers, it also creates a deadweight loss, a net reduction in total economic welfare because consumers pay higher prices and some mutually beneficial trades no longer occur. The current US tariff regime is estimated to reduce long-run GDP by 0.2% to 1.2%, depending on the scenario.
Comparative Advantage
The principle, first articulated by David Ricardo, that countries benefit from trade when each specialises in producing what it can make at the lowest opportunity cost. Tariffs disrupt this process by artificially raising the cost of foreign goods, leading countries to produce things they are comparatively less efficient at, reducing overall global output.
Trade Diversion
When tariffs target one country (such as China), importers often switch to alternative suppliers (such as Vietnam or India) rather than buying domestically. This “diversion” means trade patterns shift rather than disappear. In 2025, US smartphone imports from China fell by $18 billion, but India’s smartphone exports to the US rose by $15 billion, the goods still came from abroad, just from a different source.
Beggar-Thy-Neighbour Policy
A strategy where one country tries to improve its own economic position at the expense of others, typically through tariffs, competitive devaluation, or trade restrictions. History shows these policies tend to provoke retaliation, leaving all countries worse off. The 1930s trade wars following Smoot-Hawley are the textbook example; the 2025–2026 tariff war risks repeating elements of that pattern.
Want to understand these concepts in more depth? Explore our full library of economic explainers, from comparative advantage to the gravity model of trade.
Explore the MASEconomics Blog →Conclusion
The global tariff war of 2025–2026 is the most significant upheaval in international trade policy since the aftermath of World War II. It has raised consumer prices, disrupted supply chains, and reshaped trade flows across every major economy. It has also demonstrated something that economists have long argued: tariffs are a blunt instrument that creates as many problems as they solve.
The Supreme Court’s rejection of IEEPA tariffs introduced a new dimension of legal and constitutional uncertainty. The Section 122 tariffs that replaced them have a built-in 150-day expiration. The Section 301 investigations will take months to conclude. And the broader geopolitical context, including the Middle East energy crisis, AI-driven structural change, and the splintering of multilateral institutions, ensures that trade policy will remain at the centre of global economic debate for years to come.
The critical question is whether the world will find a new equilibrium, a stable, rules-based system that accounts for the legitimate concerns behind the tariff movement, or whether the current period of instability becomes the new normal. As trade dispute mechanisms weaken and bilateral deals proliferate, the answer is far from certain.
Did you find this article helpful? Share it with someone who loves economics. And remember, at MASEconomics, we make complex ideas simple.
