At his confirmation hearing last week, Treasury Secretary-nominee Scott Bessent mentioned "optimal tariff theory," which is something that always triggers me (although as I'll say later, I'm not sure he meant what he seemed to):
Senator Ron Wyden: On the tariffs, Donald Trump, with no plan and no strategy, says he's going to put across the board tariffs, blanket tariffs, on all imported goods, which means that our workers and our small businesses are going to get clobbered with additional taxes on practically everything they buy from other countries. My question here is, who would pay these tariffs? Americans or foreign countries?
Bessent: Senator Wyden, just to understand so I can frame the answer correctly, do you believe that these tariffs are a consumption tax increase?
Wyden: I believe these tariffs, you can call it whatever you want in terms of trying to gussy it up, they're going to be paid for by our workers and small businesses. All through the campaign, we heard they weren't, that foreign countries were going to pay it. I think that's baloney. It's going to be paid for by workers and small businesses. So, your response.
Bessent: Yes, Senator, I would respectfully disagree. And the history of tariffs and tariff theory, optimal tariff theory, does not support what you're saying. Traditionally, we see that the currency -- if we were to say, use a number that has been thrown around in the press of 10% -- then traditionally the currency appreciates by 4%. So the 10% is not passed through. Then we have various elasticities. Consumer preferences may change. And finally, foreign manufacturers, especially China, especially China, which is trying to export their way out of their current economic malaise, they will continue cutting prices to maintain market share.
Wyden: That's an academic view of it, but what I know is the history of this is, it clobbers people of modest means. They're the people who are going to get hit. And all through the campaign, there was a big show that it was going to be paid for by foreigners -- not so.
(emphasis added)
When "optimal tariffs" come up in the public discourse, I sometimes get the sense that people are using the term just to mean "really good and effective" tariffs. "Optimal tariff" has a more specific meaning, though, which you can check out here and here, but also I'm going to dust off my bookshelf for some Samuelson/Nordhaus (Economics, 1989) and Krugman/Obstfeld (International Economics, 1991) explanations.
Samuelson/Nordhaus give the idea of optimal tariffs some credibility as long as you focus only on the impact of the optimal tariffs themselves, but then they point out that other countries will retaliate and therefore everyone is worse off overall:
The "Terms-of-Trade" or "Optimal-Tariff" Argument
One valid argument for a country's imposing tariffs on its trade is that it will "shift the terms of trade in its favor and against foreign countries.'' Recall that terms of trade represent the ratio of export prices to import prices. To shift the terms of trade against foreigners means that levying tariffs on imports will reduce the world price of imports while increasing the prices of our exports. By shifting the terms of trade in our favor we can export less of our wheat and aircraft in order to pay for imports of oil and cars. The set of tariffs that maximizes our domestic real incomes is called the optimal tariff.
... We can understand it in a simple case by considering an optimal tariff on oil. Mill would note that the optimal tariff on oil will raise the price above the foreign price. But with out demand now curtailed, and because we are a significant part of the world demand for oil, the world market price of oil will be bid down. ...
...
Have we not therefore found a theoretically secure argument for tariffs? The answer would be yes if we could forget that this is a ''beggar-thy-neighbor" policy and ignore the reactions of other countries. But other countries are likely to react. After all, if the United States were to impose an optimal tariff of 30 percent on its imports, why should the European Community and Japan and Brazil not put 30 or 40 percent tariffs on their imports? In the end, as every country calculated and imposed its own domestic optimal tariff, the overall level of tariffs might climb to 30 or 50 percent.
But such a situation would surely not in the end represent an improvement of either world or individual economic welfare. When all countries impose optimal tariffs, it is likely that everyone's economic welfare will decline as the impediments to free trade become great. ...
Krugman/Obstfeld are even more skeptical. They start out by noting the possibility of an optimal tariff leading to overall benefits in the case of large countries:
One argument for deviating from free trade comes directly out of cost-benefit analysis: for a large country that is able to affect the prices of foreign exporters, a tariff lowers the price of imports and thus generates a terms of trade benefit. This benefit must be set against the costs of the tariff, which arise because the tariff distorts production and consumption incentives. It is possible, however, that in some cases the terms of trade benefits of a tariff outweigh its costs so there is a terms of trade argument for a tariff.
Then they provide the following useful clarification:
... (By convention the phrase ''optimum tariff" is usually used to refer to the tariff justified by a terms of trade argument rather than to the best tariff given all possible considerations.) ...
This makes my point about about "optimal tariff" not meaning just a really good and effective tariff.
Finally, they pile on the criticism:
The terms of trade argument against free trade has some important limitations, however. Small countries have very little ability to affect the world prices of either their imports or other exports, so that the terms of trade argument is of little practical importance. For big countries like the United States, the problem is that the terms of trade argument amounts to an argument for using national monopoly power to extract gain at other countries' expense. The United States could surely do this to some extent, but such a predatory policy would probably bring retaliation from other large countries. A cycle of retaliatory trade moves would, in turn, undermine the attempts at international trade policy coordination described later in this chapter.
The terms of trade argument against free trade, then, is intellectually impeccable but of doubtful usefulness. In practice, it is emphasized more by economists as a theoretical proposition than it is used by governments as a justification for trade policy.
(Krugman has noted elsewhere that the optimal tariff argument "plays almost no role in real-world disputes over trade policy.")
Over the years, when this subject has come up, I've asked people to point me to a tariff out there in the real world that they think constitutes an "optimal tariff," in the sense of affecting the terms of trade so as to make the country better off. No one has taken me up on it yet, which leaves me skeptical that the term has any practical relevance. But given that, as noted, the term kind of sounds like it just means "really good and effective tariff," we may not have heard the last of it from tariff proponents.
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