Trump Is trying to tariff the laws of economics 

On March 11, the Trump administration opened a sweeping new Section 301 investigation into what it calls “structural excess capacity” in global manufacturing. The list of 16 suspects under investigation is breathtaking, and includes China, the European Union, Japan, India, Mexico, Singapore, Switzerland and Norway. 

The argument is simple: If a country produces more manufactured goods than it consumes domestically, and those goods end up getting sold in the U.S., then Washington sees this as evidence of unfairness. 

But that’s not how trade works. 

Trade surpluses in manufacturing are not proof of misconduct. They’re the natural result of differences in savings, consumption and industrial specialization across economies. By treating trade surpluses themselves as suspicious, the administration risks turning Section 301 from a targeted enforcement tool into a weapon against basic laws of economics. 

Section 301 was rolled out in the 1974 Trade Act to respond to specific foreign policies that burden U.S. commerce, like forced-technology transfer, discriminatory regulations or market-access barriers. It was never meant to police global trade balances. 

But the new investigation treats large or persistent trade surpluses as evidence of “structural excess capacity.” Worse, the notice uses such vague language and loose economic reasoning that almost any country could be found guilty of “structural overcapacity.” 

To be sure, that diagnosis could be triggered by almost any combination of the following indicators: a capacity utilization rate below roughly 80 percent, a bilateral trade deficit with the U.S., policies ranging from subsidies and state-owned enterprises to wage suppression or weak labor and environmental standards or even broader macroeconomic conditions like saving-investment imbalances that weaken domestic demand and promote exports. 

In other words, the criteria are so broad that they would implicate virtually every manufacturing economy in the world. That’s clearly not a bug, but a feature of an investigation that seeks to backfill the tariffs lost when the Supreme Court struck down the ones Trump invoked under the International Emergency Economic Powers Act. 

But Germany runs trade surpluses because it specializes in high-value manufacturing. Switzerland runs them because of pharmaceuticals and precision machinery. Singapore does because it sits at the center of global semiconductor supply chains. Norway because it exports energy and seafood. 

For that matter, the United States runs a large and rapidly growing trade surplus in services, driven by U.S. technological leadership. In 2025, that surplus reached a record $339.5 billion, an 8.9 percent increase from the previous years. None of these outcomes are signs of cheating. They’re the predictable results of comparative advantage. 

The investigation also blurs an important line between government policy and economic structure. In some cases, like China’s steel sector, state subsidies and industrial policy clearly distort global markets. But the notice goes much further by implying that export-oriented growth models themselves constitute unfair trade practices. 

That logic would put much of the global trading system on trial, including the United States itself. If exporting successfully is taken as evidence of wrongdoing, Washington will have declared war not just on competitors, but on the very idea of international trade. Turning Section 301 into a global indictment of manufacturing surpluses will alienate partners whose cooperation the U.S. needs on everything from supply chains to security policy.  

Moreover, tariffs can’t solve the problem the administration claims to be addressing. America’s trade deficits are driven largely by domestic macroeconomics: strong consumer demand, relatively low savings and the dollar’s role as the world’s reserve currency and a structural shift toward a services economy. Those fundamentals ensure that the United States imports more than it exports. 

Tariffs don’t change that equation. What they’ll do is raise costs for American manufacturers that rely on imported inputs and invite retaliation against U.S. exports. Put another way, Washington is erroneously trying to solve a macroeconomic reality with a trade policy hammer. 

None of this means the United States should ignore genuine trade distortions. Industrial subsidies, forced-technology transfer and discriminatory regulations deserve scrutiny — and sometimes retaliation. But that requires targeted enforcement against specific practices, not a sweeping investigation that treats export success with suspicion. 

If trade surpluses become evidence of unfair trade, the U.S. will be attempting something unprecedented: using tariffs to punish other countries simply for selling goods the rest of the world wants to buy. 

That’s not trade enforcement. That’s Washington trying to tariff the laws of economics. 

Marc L. Busch is the Karl F. Landegger Professor of International Business Diplomacy at the School of Foreign Service, Georgetown University. Nuno Limāo is the Wallenberg Professor of International Business and Finance at the School of Foreign Service and Department of Economics, Georgetown University. Rodney D. Ludema is Professor in the Department of Economics and the School of Foreign Service, Georgetown University.

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