One of the most significant disagreements surrounding the proposed Net-Zero Framework concerns its economic mechanism. The proposal combines fuel-intensity requirements with a system under which ships exceeding specified emissions thresholds would incur compliance costs. The mechanism is intended to encourage the adoption of lower-emission fuels and technologies while generating resources to support the maritime energy transition.

Supporters argue that an economic mechanism could help address the price difference between conventional marine fuels and lower-emission alternatives, providing greater certainty for shipowners, fuel suppliers, and investors. Others have raised concerns about introducing additional costs into an industry that underpins international commerce, particularly for developing economies with limited domestic production capacity or significant dependence on imported goods.

In October 2025, the Center for Ocean Policy and Economics published How IMO’s Proposed “Net-Zero Framework” (NZF) Would Create Inflation for Small Island and Developing States, drawing attention to the potential inflationary implications of the proposed framework for economically vulnerable countries.

For small island economies, shipping is frequently the principal means of obtaining essential goods, including food, fuel, construction materials, and manufactured products. Higher transportation costs can create additional pressure on import prices, although the extent of that pressure depends on trade patterns, market conditions, and how costs are passed through the supply chain. These effects may be particularly significant in countries already facing high transportation costs, limited shipping connectivity, or constrained fiscal resources.

A 2021 study published in Marine Policy, The Impacts of Carbon Pricing on Maritime Transport Costs and Their Implications for Developing Economies, found that the effects of maritime carbon pricing on average transport costs may be relatively limited, while certain small island developing states and least developed countries are more likely to experience disproportionately adverse consequences.

A subsequent 2025 study in Resources, Conservation and Recycling, Island Economies in the Wake: Assessing Increased Shipping Cost Effects from Carbon Taxes on Maritime Trade, similarly examined differences in countries’ exposure to maritime carbon-pricing measures. Its findings suggest that certain developing economies could experience greater economic and sectoral impacts than larger trading nations.

Together, these studies highlight an important distinction: modest costs at the global level can still translate into significant pressures for particular trade routes, industries, or import-dependent economies. Policymakers must therefore consider not only the overall economic impact of proposed measures, but also how those costs would be distributed.

This raises questions about the structure of emissions-pricing mechanisms and the extent to which international regulations should account for differences in national economic circumstances.

In a 2024 article published in the Review of European, Comparative & International Environmental Law, Goran Dominioni examines the relationship between carbon pricing for international shipping, equity, and World Trade Organization law. The research considers how measures intended to accommodate developing economies might interact with international trade obligations and the conditions under which differentiated treatment could be legally justified.

Applying a uniform emissions price across the global fleet may simplify regulatory administration, but it does not guarantee equitable economic outcomes. Conversely, introducing exemptions or preferential treatment may help address economic vulnerabilities while creating questions about consistency, legal compatibility, and regulatory effectiveness.

An alternative is to maintain common requirements while providing financial assistance, revenue allocation, or technical cooperation to address disproportionate impacts. Such measures could include investments in port infrastructure, alternative-fuel availability, technology transfer, and maritime workforce development.

The proposed IMO Net-Zero Framework already incorporates elements of this approach. Its proposed Net-Zero Fund is intended to support innovation, infrastructure, and capacity-building initiatives, while also mitigating negative impacts on vulnerable states, including small island developing states and least developed countries.

However, the inclusion of these provisions does not, by itself, establish that the resulting assistance would adequately offset higher transportation costs. Their effectiveness would depend on how revenues are distributed, whether support reaches the countries and sectors most affected, and the extent to which assistance addresses immediate economic pressures as well as longer-term investment needs.

A credible regulatory framework should therefore be informed by comprehensive economic impact assessments and transparent mechanisms for evaluating the effectiveness of proposed mitigation measures. This is particularly important for countries whose dependence on maritime transportation makes them vulnerable to changes in shipping costs.

The objective should be to ensure that environmental progress does not come at the expense of avoidable economic hardship, particularly for countries with limited capacity to absorb additional costs.