Trump Administration Eyes New Tariffs on 'Structural Excess Capacity.' The Policy Has a Logic Problem.

What Greer Is Arguing

U.S. Trade Representative Jamieson Greer announced in March that the Trump administration is preparing a formal report on what it calls "structural excess capacity" — a situation where foreign countries manufacture more goods than their domestic markets can absorb and then export the surplus, undercutting American producers.

In a CNBC interview earlier this month, Greer described structural excess capacity as one of the "unfair trading practices" that a new round of tariffs will target later this year, according to Reason.

This is not a minor rhetorical position. The administration is pursuing this as one of two primary legal avenues to rebuild its tariff architecture after the Supreme Court struck down the earlier version in February. That earlier regime relied on an expansive reading of executive emergency powers that the Court rejected. The new approach leans on Section 301 of the Trade Act of 1974, which authorizes tariffs against specific unfair foreign trade practices. This is narrower ground, but somewhat more defensible legally, according to Reason.

The Boeing Problem

In 2025, Boeing produced roughly 600 commercial airliners from its facilities in Washington state and South Carolina, according to Reason. U.S. domestic airlines cannot absorb anywhere near that number. The surplus gets exported. The United States routinely ships billions of dollars in commercial aircraft and related equipment to foreign buyers every year.

By the definition Greer is using, Boeing is a textbook example of structural excess capacity. American workers build far more planes than Americans can use and sell the rest abroad.

Nobody in the administration is calling that a problem. They're calling it an American success story, which it is. Boeing's workers have more hours, better pay, and stronger job security precisely because foreign airlines buy their planes. The foreign buyers benefit too: they get world-class aircraft without needing to develop their own airliner industry from scratch.

Greer's framing only classifies this as a problem when other countries do it.

The Strongest Case for the Policy

Not all excess capacity is equivalent. The steel and solar panel cases, the industries most often cited in the excess-capacity debate, involve documented government subsidies, below-cost pricing, and state-directed overproduction, particularly from China. That is a meaningfully different situation from Boeing competing on merit in global markets.

If a foreign government is artificially inflating production through subsidies and then dumping products at prices no private company could sustain, that does distort markets. It can hollow out domestic industries that would otherwise be viable. Economists across the political spectrum acknowledge that predatory, subsidy-fueled dumping is a legitimate trade grievance. The disagreement is over whether broad tariffs are the right remedy.

The administration's supporters would argue that calling all excess capacity "unfair" is simply aggressive negotiating language, and that the actual tariff targets will be narrowed to genuinely subsidized sectors. That may prove true. But Greer's public statements have not drawn that distinction clearly.

The Legal and Economic Risk

Section 301 investigations require the USTR to demonstrate that a specific foreign practice is unreasonable or discriminatory and burdens U.S. commerce. Winning that case on "excess capacity" alone, without tying it to explicit subsidies, currency manipulation, or other documented distortions, will be harder than the administration's tone suggests.

And even where the legal case holds, the economic case is murkier. Tariffs designed to punish foreign overproduction tend to raise input costs for American manufacturers who use those imported goods. Steel tariffs, for example, lower costs for domestic steelmakers but raise them for every American industry that buys steel: auto manufacturers, construction, appliance makers. The net employment effect has been contested by economists for years.

The Peterson Institute for International Economics estimated in prior tariff rounds that protected jobs in targeted sectors came at a significant cost to jobs in downstream industries. The administration disputes those models. Neither side has a clean, uncontested answer.

What Comes Next

Greer's office is expected to release the formal Section 301 report before any new tariffs are announced. That document will matter enormously. If it draws a tight, evidence-based definition of actionable excess capacity, one tied to specific subsidy programs and documented below-cost pricing, the legal and economic argument becomes substantially stronger.

If it relies on the broad framing Greer has been using publicly, where any country that exports more than it consumes domestically is engaging in an "unfair trading practice," the administration will have defined a standard that implicates American exporters in virtually every globally competitive U.S. sector: agriculture, semiconductors, pharmaceuticals, aerospace.

The formal report will reveal whether the definition narrows or enshrines the contradiction.