The Half-Trillion-Dollar Cost of Turning Away Foreign Students

The United States has never really had a system for hiring brilliant scientists from abroad. No talent scout knocks on doors in Bangalore or Shanghai. No government agency drafts the next generation of chip designers and protein chemists into the country.

What it has instead is a side door, and almost everyone who matters walks through it the same way: as a foreign student. As one National Academies committee chair put it, “the United States has a talent program; it’s called graduate school.”

That door is now closing. According to a June 2026 policy brief from the Peterson Institute for International Economics, the number of student visas the US issued in 2025 ran about a third below normal, and the people who wrote it think the bill for that will eventually be measured in the hundreds of billions of dollars a year.

To understand why a dip in student visas turns into a macroeconomic problem, you have to follow the pipeline the brief lays out, which is less a metaphor than an actual sequence of forms and deadlines.

Of every 100 foreign students who earn a STEM degree at a US university, 64 stay on to work through a scheme called Optional Practical Training, a bridge of up to three years that carries graduates toward the H-1B visa lottery. Forty-seven eventually land an H-1B. About 38 are still in the country eight years later, by then often holding a green card or settled into long-term work. These aren’t marginal figures. Foreign-born workers already make up 30 percent of the high-skill STEM workforce, and just under half of everyone holding a STEM PhD.

Strip a third off the front of that pipeline and the effect ripples all the way down. The brief’s authors, the economist Michael Clemens and his colleagues Jeremy Neufeld and Amy Nice, calculate that a sustained one-third drop in foreign STEM graduates would shrink the high-skill STEM workforce by 6.2 percent overall, and by 11.5 percent at the doctoral level.

The Number That Should Worry Treasury

Here’s where it stops being an immigration story and becomes an economics one. High-skill STEM workers are roughly 4.7 percent of the US labour force, but they pull above their weight: they patent more than comparable US-born colleagues, they raise the patenting rates of the people working alongside them, and they found a large share of the country’s most valuable companies. Three-quarters of the foreign-born founders of America’s highest-potential venture-backed startups first arrived as international students. Lose a slice of that workforce and you lose a slice of the innovation it generates.

Run the elasticities economists have spent two decades estimating, and the brief lands on a figure that’s hard to shrug off: a decade of this would leave annual US GDP between 0.79 and 1.57 percent smaller than it would otherwise be. In dollars, that’s $240 billion to $481 billion every year, gone. Comparable, the authors note, to the entire economy of South Carolina, or Utah, or Wisconsin simply vanishing.

The objection is that someone else will fill the gap. Surely if fewer foreign graduates compete for those jobs, American-born students will pour into STEM programmes, or skilled workers will be recruited straight from overseas instead? It’s a reasonable thought. It’s also, the evidence suggests, wrong on both counts, and the brief leans on a neat natural experiment to show why.

The Replacements Who Never Arrive

Back in 2008, the government expanded the OPT scheme, and the number of STEM graduates working under it rose sixfold over the following decade. If those extra graduates had been scrapping over a fixed pool of H-1B visas, you would expect each one’s odds of winning a visa to fall. They didn’t. The transition rate held steady at around 50 percent, partly because many graduates went into universities and nonprofit labs where the H-1B cap doesn’t apply, expanding the pie instead of fighting over it.

Crowding people in, in other words, didn’t crowd anyone out, which strongly implies that crowding them out now won’t crowd anyone helpful in. As for US-born students, decades of research find that international enrolment, across the system as a whole, tends to increase native enrolment instead of displacing it, because foreign tuition helps fund the very programmes everyone else attends.

None of this is happening by accident. The director of US Citizenship and Immigration Services said in 2025 that the aim was to “make it abundantly difficult…for [graduating foreign] students…to continue to live and work in the United States.” On that narrow measure, the policy is succeeding nicely.

What it’s also doing, the brief argues, is handing a gift to the competition. The talented graduates turned away don’t evaporate. By one estimate the authors cite, for every ten high-skill STEM workers blocked from the US, six end up plying their trade back home (think China and India) and four set up somewhere else entirely, often Canada or Germany, countries that have spent recent years making themselves conspicuously welcoming to exactly this crowd. A survey of more than a thousand current international students and postdocs, taken in September 2025, found that over 49 percent said that had they known what was coming, they would probably or definitely never have come at all. The deterrent, in short, is already biting, and may yet bite harder.

Clemens and his co-authors are careful to say it’s not too late. Their working paper, commissioned by the National Academies, carries the glum title “Brain Freeze,” but its closing pages read more like a to-do list than an obituary: guarantee students’ visa status for the length of their programmes, write postgraduation work rights into law, rework the H-1B lottery so recent graduates aren’t penalised, and unclog the green card backlog that has graduates waiting years for a decision.

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