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How do tariffs hurt the dollar?

Summary

Roughly two thirds of countries on Earth stabilize their currency against the U.S. dollar. The relationship has benefits in both directions: Smaller countries enjoy better stability for their national currencies, and U.S. companies and government get low borrowing rates, among other benefits. But a new BPEA paper, “Trade War and the dollar anchor,” highlights how U.S. tariffs and retaliatory tariffs by other countries are putting pressure on the dollar’s place at the heart of world monetary system. On this episode of the Brookings Podcast on Economic Activity, one of the paper’s coauthors, Tarek Hassan of Boston University, will speak with Brookings Director of Trade and Economic Statecraft Kari Heerman about his study.

Full Text

Roughly two  thirds of  countries on Earth stabilize their  currency  against the U.S. dollar.

The relationship has benefits in both directions: Smaller countries  enjoy better stability for their national currencies, and  U.S. companies and  government get low borrowing rates, among other benefits.

But  a new BPEA paper, “Trade War and the dollar anchor,” highlights how U.S. tariffs and  retaliatory tariffs by other countries are putting pressure on  the dollar ’ s place at the heart of world monetary system.

On this episode of the Brookings Podcast on Economic Activity, one of the paper’s coauthors, Tarek Hassan of  Boston University, will speak with Brookings Director of Trade and Economic Statecraft Kari Heerman about his study.

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Transcript

[music]

EBERLY: Iam Jan Eberly, the James R. and Helen D.

Russell Professor of Finance at Northwestern University.

STEINNSON: And I’m Jón Steinsson, Marek Professor of Public Policy and Economics at the University of California Berkeley.

EBERLY: We are the co-editors of the  Brookings Papers on Economic Activity, a semi-annual academic conference and journal that pairs rigorous research with real-time policy analysis to address the most urgent economic challenges of the day.

STEINNSON: And this is the  Brookings Podcast on Economic Activity, where we share conversations with leading economists on the research they do and how it will affect economic policy.

EBERLY: Thank you for joining us for season seven of the podcast.

This season we’ll be listening to discussions about papers from the fall 2025 BPEA conference hosted by Brookings on September 25th and 26th.

STEINNSON: We’re excited this season to have some new voices contributing to our discussions with experts from Brookings Metro and Foreign Policy programs leading interviews in addition to scholars in the Economic Studies program.

EBERLY: That’s right, and they’ll be discussing a wide range of topics as usual, from climate change to fertility rates to automation.

But let’s jump into today’s discussion, which focuses on a particularly timely topic, international trade.

Hosting today’s interview will be Kari Heerman, Brookings’ new Director of Trade and Economic Statecraft, who will be speaking with Tarek Hassan of Boston University, co-author of the new BPEA research “Trade War and the Dollar Anchor” with Thomas Mertens, Jingye Wang, and Tony Zhang.

STEINNSON: This is absolutely a very timely topic.

Steven Miran, who is currently on leave from serving as the Chairman of the Council of Economic Advisors while he serves as a governor at the Federal Reserve, has argued that the U.S. dollar’s central role in the global trading system is a burden that has contributed to the hollowing out of the U.S. manufacturing sector.

This view contrasts strongly with the more conventional view that the dollar generates an exorbitant privilege that is a benefit to the United States.

Tarek’s paper seeks to understand how the trade war will affect the role of the dollar.

EBERLY: Now let’s turn it over to Kari.

HEERMAN: Thanks, Jan and Jón, happy to be here, and welcome, Tarek.

Tarek, if Iunderstand correctly, the key insight in your paper is that the dollar’s special role as the world’s anchor currency and the benefits it provides to American businesses and families could be lost if the U.S. engages in trade wars.

I’d like to start by unpacking the two key terms in your title, “trade war,” and “dollar anchor.”

Let’s start with the second one.

What exactly is the dollar anchor and how does it connect to the idea of the dollar’s safe haven status and exorbitant privilege that you mentioned in the paper?

And what does all that mean in practical terms for American businesses and families?

[3:15]

HASSAN: Yeah, gladly.

Thanks for having me.

So, the dollar anchor means that the U.S. dollar is very much at the center of the world monetary system.

So, this is not necessarily widely known, but most currencies in the world are stabilized against the U.S. dollar, meaning other countries that are trying to improve the safety properties of their own currencies, intervene in currency markets to minimize fluctuations against the dollar.

So, the dollar is special among the world currencies in that it appreciates in times of global stress.

So a key example of this is during COVID or during the global financial crisis, when basically the world economy tanks, the U.S. dollar appreciates, it’s a safer store of value for that reason, and that’s why people call it a safe haven, or it’s probably the world’s safest currency in that sense.

HEERMAN: So, it gets more valuable when things are going wrong in the world.

The dollar becomes more valuable, more or less.

[4:15]

HASSAN: That’s right.

People often call it “flight to safety” or something like that, but the fact is that the dollar is one of the few currencies in the world that retained their value even in bad times.

That’s what we mean by that.

HEERMAN: Great.

And what about that exorbitant privilege?

How does that connect to the Safe Haven status and what does it mean for everyday Americans?

[4:34]

HASSAN: Yeah, so the famous fact about the U.S. dollar is that it has famously low interest rates.

So compared to other similar currencies, the interest rates that Americans pay on their car loans or their mortgages, and that the U.S. government pays when it borrows, are lower than comparable other countries.

And that’s what we mean by exorbitant privilege.

And the reason this happens is because the dollar is a safe currency.

Companies around the world from many other countries are willing to lend in U.S. dollars.

So that means that Americans and American companies can borrow from foreigners in U.S. dollars and at lower interest rates.

So, in other words, it makes us richer.

You get more investment because we have low interest rates and because our currency is safe.

HEERMAN: Great.

Now as a final step, let’s get to that term in the title of your paper, the dollar anchor.

What is the dollar anchor and how does it relate to those other two concepts that you just talked about?

[5:38]

HASSAN: Yeah, so because the dollar is safe and has low interest rates, other countries, when they want to attract foreign investment intervene in their currency markets to stabilize their exchange rates against the U.S. dollar.

So roughly two thirds of countries in the world have some stabilization policy against the U.S. dollar.

So, in this sense, the dollar is the anchor of the world monetary system.

The vast majority of countries are trying to stabilize the value of their currencies against this central anchor, the US dollar, and that has many, many different implications for Reserve holdings and many other policies that foreign countries adopt.

HEERMAN: That all sounds really good, sounds really good for us.

Being richer and having famously low interest rates sounds like a great thing to have.

Ifeel like we should try to hold onto that.

Have you seen anything in the data or in the news lately that suggests that all of this is at all on shaky ground?

[6:37]

HASSAN: Yeah, so Imentioned that the reason we know the dollar is safe is that it appreciates generally when there’s times of stress in the global economy.

We are now in such a time of stress.

So, in the same way that COVID and the global financial crisis were sort of a problem for the world economy, the trade war that started in April of this year is a similarly sized problem, if you go and look at measures that we have of how worried managers are around the world, for example.

So, what we would’ve expected, typically in times of global stress, we see two things happening: the U.S. dollar appreciating and U.S. interest rates dropping.

What we saw this time around and what we’re currently seeing is actually the opposite.

So, the dollar has been flat or has actually depreciated against many foreign currencies, and US interest rates are actually increasing rather than decreasing.

HEERMAN: That’s a little troubling.

For some lighter fare, let’s turn to the trade war.

That’s something, as you mentioned, people have probably been hearing about in the news lately.

Can you talk a little bit about how you defined a trade war and what you’re seeing in trade policy globally that fits that definition and how it appears in your model?

[7:51]

HASSAN: Yeah, so the trade war that we study in our model is a bit simplified.

So essentially, we’re saying the U.S. is gonna tax imports at some rate.

Let’s say 17% and foreign countries retaliate, meaning that U.S. exports are also taxed at 17%.

In the data, what we’ve seen is a little bit less than that.

So, at the time of this recording, as of September 2025, on average, the U.S. now charges 17% on imports, and foreign countries have retaliated about half that.

So the average tariff, if you take the average between imports and exports is closer to 12% now.

So, a trade war happens when one country starts levying tariffs and other countries respond.

HEERMAN: Now let’s just put this all together.

Can you break down the mechanics that link this trade war, trade policy to the dollar special benefits and all that good, famously, low interest rates making us richer, goodness.

[8:51]

HASSAN: Yeah.

So what happens in our model actually happens in many, many macro models is a fairly standard thing.

We just basically point out that this applies to the current situation.

So, a prediction of many macro models is that when a country’s currency appreciates that countries starts importing more traded goods.

So, when your currency

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Document ID: how-do-tariffs-hurt-the-dollar