Twice this month, the White Home has used a Hamilton affiliate professor’s analysis to assist justify U.S. President Donald Trump’s jaw-dropping tariffs and ongoing commerce battle with China.
Each occasions, the Trump administration obtained it improper, stated Pau S. Pujolas, an affiliate economics professor at McMaster College.
“On the one hand, it is like, ‘Wow, I am having enter,'” Pujolas advised CBC Hamilton on Friday. “Then again, it isn’t what this paper deserves.”
The primary time the White Home cited the 2024 paper, “Commerce deficits with commerce wars,” was in its rationalization of the way it calculated the slew of “reciprocal tariffs” geared toward dozens of nations. Pujolas’s article is among the many references.
These tariff numbers had been additionally listed in the massive chart Trump held up throughout his April 2 “Liberation Day” announcement when he detailed a ten per cent blanket tariff fee on almost each nation, with many getting hit harder.
It was the second time, on Monday, that basically caught Pujolas’s consideration and that of his colleagues.
The economist was in a faculty fitness center having simply received a basketball sport — and a spot within the finals of a “very novice league,” he stated — when he noticed a textual content from a mentor and good friend warning him, “You are well-known. I am undecided you are going to prefer it.”
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Trump’s high financial adviser, Stephen Miran, who helped craft the tariffs, made the case for them at a conservative analysis institute in Washington, D.C. The White Home printed a transcript of his remarks online, together with a footnote to Pujolas’s paper, which is the one tutorial analysis cited.
“Newer financial analyses … present that by imposing tariffs in opposition to exporting nations, the U.S. can enhance financial outcomes, elevate revenues and impose big losses for the tariffed nation, even with full retaliation,” Miran stated.
However the conclusions Pujolas and co-author Jack Rossbach, an assistant professor at Georgetown College in Washington, D.C., made of their paper weren’t that easy, Pujolas stated.
They usually definitely do not help Trump’s 145 per cent tariffs on all Chinese language items, he stated.
(Beijing hit back with 125 per cent tariffs on U.S. imports on Friday.)
‘Commerce wars are unhealthy all the time’
Pujolas and Rossbach used mathematical modelling to find out how commerce imbalances affect a rustic’s welfare, specializing in the U.S. commerce deficit with China and the affect of tariffs throughout Trump’s first time period in 2018 to the tip of former president Joe Biden’s time period in 2024.
“The intent of the papers was to grasp the motivation — why this will occur and what are the results?” he stated.
What they discovered was if the U.S. had put particular tariffs on particular merchandise from China (which did not occur), “there was room for modest development or positive factors on the massive expense of China,” Pujolas stated.
That is the message the White Home has seized on — the doable advantages it might acquire, he stated.
However the paper comes to a different conclusion, too. The very best end result globally can be no tariffs, Pujolas stated.
“We need to keep away from commerce wars,” stated Pujolas. “Commerce wars are unhealthy all the time and all over the place.”

Pujolas had anticipated the paper to convey a type of warning to policymakers on the World Commerce Group (WTO), for instance, that commerce deficits must be averted when nations enter multilateral agreements.
Deficits can result in nations adopting tariffs they assume shall be helpful, however truly trigger extra hurt to the worldwide financial system than good domestically, he stated.
He and Rossbach co-authored one other paper, printed in February, about how Canada ought to react to U.S. tariffs.
They discovered Canada ought to focus much less on retaliatory tariffs and extra on eradicating interprovincial trade barriers.
“I am very blissful that message caught steam,” he stated.
As for the White Home citing his different paper, Pujolas stated there’s not a lot he can do about it, but when they had been to succeed in out, “I’d instantly inform them to cease.”
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