The maritime economy is no longer only about ships and ports. It is the economic system built around oceans, coasts, shipping lanes, ports, fisheries, offshore energy, shipbuilding, marine tourism, maritime finance, naval logistics, and increasingly offshore wind, seabed cables, marine data, and blue carbon.

The OECD defines the ocean economy as activities that take place on the ocean, depend on ocean resources, or benefit from proximity to the sea. In practical terms, this includes both traditional sectors such as shipping, fishing and offshore oil, and emerging sectors such as offshore renewables, ocean monitoring, marine biotechnology and digital maritime services.

Globally, the maritime economy is strategically important because it connects trade, food, energy and security. Around 80% of global trade by volume moves by sea, and maritime chokepoints such as the Strait of Hormuz, Suez Canal, Bab el-Mandeb and Malacca Strait can influence inflation, energy prices and supply-chain stability. During wars and conflicts, maritime industries are often among the first to feel pressure: freight rates rise, insurance premiums increase, shipping routes shift, naval security becomes costlier and ports face uncertainty.

No single country leads every dimension of the maritime economy. Instead, leadership is distributed.

This Tatvita Country Column explains the global maritime economy, comparing China, the United States, Norway, South Korea, Japan, and Greece across shipping, shipbuilding, ocean GDP, sustainable governance, jobs, ports, and conflict resilience.

China leads in scale; the United States leads in ocean GDP value; Norway offers a best-practice model in sustainable ocean governance; South Korea and Japan remain advanced shipbuilding technology powers; and Greece dominates shipping ownership.

What Is the Maritime Economy?

The maritime economy is the measurable economic value generated from ocean-linked industries. It includes goods and services produced directly from ocean use and coastal activity. A narrow definition includes shipping, ports, fisheries, offshore oil and gas, shipbuilding and marine tourism. A broader blue economy definition also includes sustainability-linked sectors such as offshore wind, coastal resilience, marine conservation, aquaculture, carbon storage and ocean data systems.

The OECD has argued that if the ocean economy were a country, it would be among the world’s largest economies, but also one under pressure from climate change, environmental degradation, slow productivity growth and geopolitical risk. Earlier OECD work estimated that ocean-based industries produced value-added equivalent to around 3% of global GDP and supported about 30 million full-time jobs in 2010.

Maritime Leadership is Multi-Dimensional

This comparison shows that maritime leadership is not one-dimensional. A country can own ships without building them, build ships without owning global fleets, or govern ocean resources sustainably without being the largest maritime power by volume.

China: Leader in Total Maritime Scale

China’s maritime economy is the largest by scale because it combines multiple forms of dominance: ports, shipbuilding, fisheries, coastal manufacturing and maritime logistics. Its coastal provinces form a dense economic belt connecting manufacturing clusters with export ports. Shanghai, Ningbo-Zhoushan, Shenzhen and Guangzhou are not merely ports; they are industrial gateways linking China’s factories to global markets.

China’s clearest advantage is shipbuilding scale. Clarksons data cited by Maritime Executive shows China captured 74.5% of global new shipbuilding orders in 2024. Other industry reporting suggests China remained dominant in 2025, with about 63% of global new vessel orders, compared with South Korea’s 21% and Japan’s 5%. This is not simply commercial success. Shipbuilding is a dual-use industry: the same industrial ecosystem that builds merchant vessels supports naval capability, steel demand, marine engines, port machinery and logistics technology.

China also benefits from Asia’s wider maritime dominance. An Asia-Pacific maritime transport report noted that China, South Korea and Japan delivered 93% of all new tonnage in 2022, while Asia controlled about half of world port capacity and handled two-thirds of global container throughput. China’s maritime model therefore rests on industrial clustering, state support, export logistics and scale economies.

However, scale also creates exposure. During geopolitical conflict, China’s maritime economy is vulnerable to chokepoints, sanctions, port restrictions and maritime insurance risks. Recent debates in the United States over fees on Chinese-built ships reflect how commercial maritime dominance can become a geopolitical issue.

Lesson from China: Maritime leadership requires integrated industrial policy. Ports, shipbuilding, manufacturing, logistics and naval strategy cannot be treated separately.

United States: Leader in Ocean GDP Value

The United States does not dominate commercial shipbuilding today, but it remains one of the world’s largest ocean economies by value. The US Bureau of Economic Analysis reported that the American marine economy contributed US$511 billion to GDP in 2023, or 1.8% of current-dollar US GDP, and generated US$826.6 billion in gross output. NOAA further reported that the US marine economy produced US$827 billion in sales in 2023.

Employment is also significant. NOAA stated in 2026 that the US marine economy employed approximately 3.7 million people, with tourism and recreation alone employing about 2.6 million people. This shows the difference between maritime “scale” and ocean “value”. The US marine economy includes not only shipping and offshore energy, but also coastal tourism, marine construction, ship and boat building, offshore minerals, fisheries, ports, research and marine services.

The US also leads in naval reach and undersea capability, but its commercial shipbuilding base is comparatively weak. Multiple reports have highlighted that the US now produces only a very small share of global commercial vessels, while China, South Korea and Japan dominate the shipyard economy. This has revived US policy debate on shipbuilding as a matter of national security.

Lesson from the US: Ocean GDP is not only about ports and ships. Marine tourism, offshore energy, coastal infrastructure, ocean science, naval systems and maritime services can create high-value employment and strategic advantage.

Norway: Sustainable Governance as a Maritime Model

Norway is not the largest maritime economy by absolute size, but it is one of the strongest examples of high-value, well-governed ocean development. The Norwegian government reported that ocean industries generated NOK 2,306 billion in value added in 2022 and employed 233,600 people. Its largest ocean industries include fisheries, petroleum and shipping.

Norway’s strength lies in governance quality. It has built an ocean economy around sustainable fisheries, offshore petroleum expertise, aquaculture, maritime services and increasingly offshore wind. Its fisheries management relies on scientific stock assessments, catch limits and strong compliance systems. Its aquaculture sector, especially salmon, has become a global export model. Its offshore energy ecosystem developed world-class engineering capability that can now be transferred toward offshore wind and subsea technologies.

Norway is also positioning for the next phase of the maritime economy. Reuters reported that Norway’s first commercial floating offshore wind tender attracted bids in 2025, with potential capacity of up to 500 MW at Utsira Nord. Norway aims to allocate areas for 30 GW of offshore wind capacity by 2040.

The Norwegian model shows that a maritime economy can be profitable and regulated. Its core policy lesson is that ocean resources should be treated as long-term assets, not short-term extraction opportunities.

Lesson from Norway: Sustainable maritime governance is not anti-growth. When science, regulation and industry are aligned, ocean sectors can generate long-term value, employment and export competitiveness.

South Korea and Japan: Leaders in Shipbuilding Technology

South Korea and Japan remain critical to the high-technology shipbuilding economy. China leads in total order volume, but South Korea and Japan retain strengths in high-value vessels, LNG carriers, specialised tankers, marine engines and advanced shipyard productivity.

South Korea’s shipbuilding sector is particularly important in LNG carriers and high-specification vessels. Industry reporting shows South Korea’s shipbuilding exports reached US$25.6 billion in 2024, growing almost 20% from the previous year and accounting for nearly 4% of South Korea’s total exports. The sector directly employs around 120,000 workers, with indirect employment much higher in industrial hubs such as Ulsan.

Japan, once the global shipbuilding leader, has lost market share but retains technical depth, marine equipment capability and high standards in ship design. Both South Korea and Japan are now strategically important because the United States and Europe are reassessing dependence on Chinese shipbuilding. South Korean shipyards have even begun naval repair cooperation with the US, showing how commercial shipbuilding expertise can become geopolitical leverage.

The technological direction of shipbuilding is also changing. Future vessels must meet decarbonisation requirements, digital navigation standards and alternative-fuel compatibility. LNG carriers, ammonia-ready vessels, methanol-fuelled ships, autonomous systems and smart shipyards are becoming the new competitive frontier.

Lesson from South Korea and Japan: Countries that cannot dominate volume can still lead in high-value niches. Maritime competitiveness increasingly depends on engineering depth, quality, fuel transition technology and specialised vessels.

Greece: Leader in Shipping Ownership

Greece offers a different form of maritime leadership: ownership and control. Greek shipowners control more than 20% of the global merchant fleet by deadweight tonnes, making Greece the world’s largest shipowning nation. The Union of Greek Shipowners reported that the Greek-controlled merchant fleet includes 5,543 ships and that its capacity has grown 53.5% over the past decade.

Other sources note that Greek-owned shipping represents around 59% of the EU-controlled fleet and contributes close to 7% of Greece’s GDP. Athens is also one of the world’s largest ship management centres, controlling more than 5,000 deep-sea vessels.

Greece’s model is asset-control driven. It does not need to be the world’s largest shipbuilder to be a maritime power. Its comparative advantage lies in ownership networks, maritime finance, commercial risk management, chartering expertise and deep relationships in global shipping markets.

However, Greek shipping is highly exposed to wars and chokepoint disruptions. Conflict can raise freight rates and benefit shipowners in some segments, but it also raises insurance costs, sanctions risk, route uncertainty and compliance burdens.

Lesson from Greece: Maritime power can come from ownership, finance and commercial networks—not only production. Countries seeking maritime growth should build maritime services, insurance, arbitration, ship finance and management ecosystems.

What Happens to Maritime Industry During and After Wars?

Wars and conflicts affect maritime industries through five channels.

First, shipping routes shift. Conflicts around the Red Sea, Black Sea or Strait of Hormuz force vessels to reroute, increasing voyage time, fuel consumption and freight rates. Second, insurance costs rise because war-risk premiums increase for vessels entering high-risk waters. Third, commodity flows are redirected. Energy, grain, fertilisers and metals often find new routes and buyers. Fourth, ship demand changes. Tankers, LNG carriers and bulk carriers may benefit from longer voyages and rerouted trade, while container shipping may suffer from uncertainty. Fifth, naval and coast guard spending rises, strengthening demand for shipbuilding and maritime surveillance systems.

Post-war recovery creates a different set of effects. Ports need reconstruction, shipping lanes need demining, insurance normalises slowly, and maritime trade patterns may not return fully to pre-war structures. Some countries lose routes permanently; others gain hub status. For example, wars can accelerate friend-shoring, naval modernisation, energy diversification and new port investment.

War and Conflict Impacts on Maritime Industry

Lessons for Other Nations

The maritime economy is too important to be left to one ministry or one sector. Countries that want to build maritime strength should draw five lessons from these leaders.

First, build port–industry integration, as China has done. Ports should not be isolated logistics assets; they should be linked to manufacturing zones, inland corridors and export clusters.

Second, measure the ocean economy properly, as the United States does through satellite accounts. Without data on marine GDP, jobs, wages and output, policy remains fragmented.

Third, govern ocean assets sustainably, as Norway demonstrates. Fisheries, aquaculture, offshore energy and coastal ecosystems require science-based regulation to avoid short-term extraction damaging long-term value.

Fourth, specialise strategically, as South Korea and Japan show. Not every country can dominate shipbuilding volume, but many can develop niches in repair, green vessels, small ships, defence vessels, marine electronics or port equipment.

Fifth, develop maritime finance and ownership ecosystems, as Greece has done. Ship ownership, insurance, arbitration, crewing, management and chartering can generate high-value services even without large shipyards.

Maritime Power in the New World Order

The maritime economy is becoming central to the new world order because it sits at the intersection of trade, energy, food, climate and security. Wars and conflicts have made this more visible. When chokepoints are threatened, shipping costs rise. When energy routes shift, tanker markets change. When naval competition intensifies, shipbuilding becomes strategic industrial policy.

The world’s leading maritime countries succeed for different reasons. China dominates total scale. The United States dominates ocean value. Norway leads in sustainable governance. South Korea and Japan lead in advanced shipbuilding. Greece leads in shipping ownership.

The future will belong to countries that combine these dimensions rather than pursuing only one. Maritime power in the 21st century will not be measured only by the number of ships or ports, but by the ability to govern ocean resources, protect trade routes, build resilient supply chains and convert maritime geography into long-term economic value.