Rethinking the Jones Act: How a Century-Old Maritime Law Shapes Domestic Shipping, Energy Costs, and National Security

Enacted in the aftermath of World War I, Section 27 of the Merchant Marine Act of 1920—commonly known as the Jones Act—stands as one of the most durable cabotage laws in American history ^{[1], [2]}. The statute dictates that any merchandise transported by water between two U.S. ports must travel on vessels that meet four strict criteria: they must be built in the United States, owned by U.S. citizens, crewed by U.S. citizens or permanent residents, and registered under the U.S. flag ^[1].

For decades, free-market economists, conservative policy organizations, and regional consumer groups have advocated reforming or repealing the law ^{[4], [5]}. Critics contend that by eliminating foreign competition along coastlines and rivers, the law inflates shipping rates, strains energy supply chains between Gulf Coast refineries and Northeast markets, and imposes disproportionate economic costs on non-contiguous states and territories like Hawaii, Alaska, and Puerto Rico ^{[2], [5]}.

Conversely, a broad coalition of maritime trade unions, domestic shipbuilders, defense analysts, and bipartisan lawmakers maintain that the Jones Act is a cornerstone of national security ^{[3], [6]}. They argue that waiving or repealing cabotage protection would decimate the domestic shipbuilding industrial base, outsource critical supply chains to foreign-flagged carriers, and undermine the surge capacity of civilian mariners required during military conflicts ^{[3], [6]}.

The Economic Cost: Shipbuilding Disparities and Operating Rates

At the center of the economic debate is the stark divergence in construction and operational costs between U.S.-flagged vessels and foreign counterparts ^{[1], [2]}. Under the domestic build mandate of the Jones Act, ship operators must purchase ocean-going vessels from domestic shipyards, where labor costs, environmental compliance, and structural component costs are significantly higher than in leading global shipbuilding hubs such as South Korea, Japan, and China ^{[2], [5]}.

According to datasets compiled by the Congressional Research Service (CRS) and the Cato Institute, a standard container ship or medium-range tanker built in an American shipyard costs between $190 million and $250 million, compared to $35 million to $50 million for an equivalent vessel constructed in an Asian shipyard ^{[2], [5]}. For specialized vessels like LNG carriers, construction estimates in domestic yards exceed $500 million per ship, representing roughly triple the cost of foreign construction ^{[2], [4]}.

Operational costs mirror this disparity. A study published by the Maritime Administration (MARAD) within the U.S. Department of Transportation found that daily operating expenses for U.S.-flagged commercial vessels average approximately $20,000 per day, compared to $7,400 per day for foreign-flagged vessels ^{[1], [2]}. Higher American crew wages, U.S. tax structures, and strict safety regulations account for over 65% of this operating cost differential ^[1].

Energy Bottlenecks: The LNG and Pipeline Conundrum

The economic impact of the Jones Act is particularly visible in domestic energy distribution ^{[2], [4]}. Although the United States became the world's largest natural gas exporter following the shale revolution, the lack of Jones Act-compliant LNG tankers restricts internal transport ^[4].

Because no U.S. shipyard has manufactured an ocean-going LNG carrier in over four decades, it is legally prohibited under Section 27 to ship liquid natural gas from export terminals in Texas or Louisiana to ports in New England, Puerto Rico, or Hawaii ^{[2], [4]}. As a consequence:

• New England Winter Spikes: During periods of peak winter energy demand, pipeline constraints from the Appalachian Basin prevent sufficient gas from reaching Boston and regional utilities ^[4]. Deprived of domestic LNG waterborne shipments, New England utilities frequently import LNG from foreign suppliers such as Trinidad & Tobago, paying international spot market rates rather than tapping domestic Henry Hub prices ^{[2], [4]}.
• Refinery Crude Transport: Gulf Coast crude oil producers often find it cheaper to ship crude to refineries in Canada or Europe on foreign tankers than to transport it to East Coast U.S. refineries via Jones Act-compliant coastal tankers, leading East Coast refiners to purchase foreign crude imports instead ^{[2], [5]}.
• Offshore Wind Logistics: The buildout of offshore wind infrastructure along the Atlantic seaboard faced delays due to a shortage of Jones Act-compliant Wind Turbine Installation Vessels (WTIVs), requiring specialized logistical workarounds with foreign feeder barges ^{[1], [6]}.

The Defense Rationale: Industrial Base and Military Sealift

While economic models underscore the freight costs associated with cabotage, defenders of the Jones Act emphasize that maritime policy cannot be evaluated strictly through a short-term price lens ^{[3], [6]}. The statutory preamble of the 1920 Act explicitly defines its goal as maintaining a merchant marine capable of serving as a naval auxiliary in times of war or national emergency ^{[1], [3]}.

Proponents point to several core national security and economic arguments:

1. Sealift Mariner Pool

The Department of Defense relies on civilian mariners to operate the Military Sealift Command (MSC) and National Defense Reserve Fleet during wartime deployments ^{[3], [6]}. Industry groups report that the domestic Jones Act fleet provides essential employment for licensed American mariners who form the reserve pool needed to crew military supply vessels in crisis scenarios ^[3].

2. Internal Waterway Security

Supporters note that over 40,000 tugboats, barges, and passenger vessels operate on inland waterways such as the Mississippi River system and Great Lakes ^[3]. Repealing domestic ownership and crewing requirements would allow foreign-owned, foreign-crewed vessels to navigate deep inside America's interior commercial arteries, raising security, labor standard, and regulatory oversight concerns ^{[3], [6]}.

3. Domestic Employment Impact

Data from the Transportation Institute and the Shipbuilders Council of America shows that the U.S. maritime sector supports roughly 650,000 jobs—including mariners, shipyard workers, marine engineers, and equipment suppliers—and contributes over $154 billion annually to gross domestic product without requiring direct federal operational subsidies ^[3].

The Full Picture: Evaluating Policy Reform Options

As policymakers weigh energy security, inflation concerns, and military readiness, discussions around the Jones Act have increasingly shifted from total repeal toward targeted modernization ^{[2], [5], [6]}.

Several reform proposals frequently discussed by policy experts include:

• Targeted Build-Requirement Modification: Waiving the domestic build requirement while retaining U.S. ownership and crewing rules ^[5]. Reformers argue this would allow American operators to buy modern, lower-cost foreign ships while preserving U.S. mariner jobs and domestic flag control ^[5].
• Energy-Specific Waivers: Granting standing waivers for non-contiguous states and specialized energy cargoes (such as LNG and crude oil) where zero domestic vessels exist ^{[2], [4]}.
• Shipyard Modernization Grants: Combining cabotage reforms with direct federal investments in shipyard automation and naval shipbuilding capacity to bolster U.S. competitiveness against heavily subsidized Asian yards ^{[3], [6]}.

Conclusion: A Century-Old Compromise in a Modern Economy

The Merchant Marine Act of 1920 represents an enduring tension between economic efficiency and national security policy ^{[1], [2], [3]}.

Empirical evidence validates key free-market critiques: the Jones Act elevates domestic freight rates, increases shipping costs for non-contiguous regions, creates energy logistics bottlenecks, and has not reversed the long-term contraction of the ocean-going commercial fleet ^{[2], [4], [5]}. At the same time, the law sustains hundreds of thousands of domestic maritime jobs, protects internal waterways, and maintains a credentialed mariner base vital to national sealift capacity ^{[3], [6]}. As domestic energy needs and global geopolitical dynamics evolve, finding a balance between maritime resilience and economic competitiveness remains a central challenge for American trade policy.