A toll on Gulf oil exports would function very differently from a tariff, with producers in the region likely absorbing the cost rather than passing it to consumers — unlike tolls on containerized goods shipped into the Gulf, an analysis published by Econbrowser argues. For readers weighing how such measures would ripple through energy and consumer-goods markets, the piece's throughline is simple: where a levy ultimately lands depends less on its size than on how far above cost the targeted producers are selling.

The distinction begins with market structure. Tariffs are generally understood to operate in competitive markets where firms earn normal profits. If that described the Gulf oil industry, producers would have to raise prices above market levels to compensate for the levy. In such a scenario, Saudi crude would trade at a $25-per-barrel premium — the value of the toll — relative to crude from a producer such as Nigeria, after adjusting for differences in quality and location. Saudi Arabia would then lose market share, and the price of oil would settle at some average of the pre- and post-toll levels — say, $15 per barrel higher, a rise partly offset by increased supply from other sources and by reduced medium-term consumption. Under those conditions, the author concedes, at least part of the toll would indeed be passed through to consumers.

But that is not how the Gulf operates, the analysis stresses. Gulf producers do not produce at marginal cost, or even average cost. Full-cycle production costs in the Gulf states — covering exploration, drilling, development, pipeline transportation, maintenance capital expenditure and operating costs — fall in the range of $14 to $18 per barrel. That gap between cost and selling price is, in the author's framing, what gives Gulf producers room to absorb a toll rather than pass it on.

On that basis, a netback of, say, $40 per barrel — an arrangement under which Saudi Arabia keeps $40 per barrel and Iran receives everything above that — would still represent a profit of more than 50% of revenues. Keeping the world oil price well above marginal cost, the author writes, is precisely the purpose of OPEC. In these circumstances, Saudi producers would have no incentive to cut output: they would remain highly profitable, and raising prices above market levels would put their market share at risk. They would therefore continue producing and absorb the toll. The analysis adds that the Saudis would in fact have an incentive to increase production to make up in volume what they lost in price — a pattern OPEC members have shown before in low-price environments, when, contrary to expectations, lower prices brought forth greater, not lower, volumes, further depressing prices. In this hypothetical, the author notes, such behavior would in turn lead Iran to restrict Gulf production — a separate thread of the scenario.

The piece also emphasizes that these would be differentiated tolls, hitting only Gulf exporters and not oil from any other producer anywhere in the world. The author offers an analogy: if the United States imposed a 50% tariff on Korean-made televisions but not on Chinese ones, and assuming televisions were fully fungible — as oil is — Korean producers could not charge more in the US market than their Chinese competitors and would have to absorb the toll to sell anything there. Because televisions are assumed to be produced around marginal cost, such a toll would exclude Korean manufacturers from the US market entirely. If, by contrast, Korean producers enjoyed very high profit margins, they could and would keep exporting to the US at thinner margins, so long as they still earned at least normal profits. That, the analysis concludes, is exactly the position Gulf oil exporters would occupy.

The author agrees, however, that tolls on container ships importing into and exporting from the Gulf would play out differently. Imagine Iran implementing a 7% toll on container imports into the UAE's Jebel Ali, the world's sixth-largest container port. The goods in those containers — mostly manufactures and processed commodities such as iron ore and steel — are typically produced in competitive markets at or around marginal cost, so any toll would have to be passed along to Gulf consumers. A $1,000 television imported into the UAE by container, for example, would rise in price by $70 under a 7% toll, and the importer would have to pass the charge to buyers — effectively a third-party tariff, since Iran is neither the exporter nor the importer in the transaction.

The core difference, the analysis concludes, is that Gulf oil exporters do not sell anywhere near marginal cost. Even an onerous toll would leave them highly profitable by any normal business standard, giving them every reason to absorb the cost and keep exporting — with an incentive to increase production. Throughout, the piece is framed as a hypothetical exercise, but the framework it leaves readers with is portable: to judge where a proposed toll or tariff would land, start with whether the producers it targets sell at, or far above, cost.