SINGAPORE, Sep 6, 2026: Southeast Asia is now a $4.5 trillion economic bloc of about 700 million people, with its 11 economies growing at more than 4.5% annually. Yet its rising economic weight is highlighting a paradox at the heart of ASEAN integration: the region has built powerful cross-border production networks, but trade among its own members remains relatively limited.
The International Monetary Fund says foreign investment reached $244 billion in ASEAN in 2025, up 10%, while manufacturing investment jumped by nearly 50%. At the same time, only about 22% of what ASEAN exports goes to other ASEAN economies, compared with about 61% within the European Union. Much of the trade that does cross ASEAN borders consists of intermediate goods and components feeding factories that ultimately serve markets outside the region.
The IMF's September 2026 analysis estimates that dismantling regional non-tariff barriers could raise ASEAN's output by 4.3% over the long term. The estimate points to a potentially significant source of additional growth at a time when conventional tariffs on intra-ASEAN trade have already been reduced to very low levels.
Southeast Asia is now a $4.5 trillion economy and one of the world’s fastest-growing regions. Yet only about 22 percent of its exports stay within the bloc. Discover more in F&D magazine’s Picture This. https://t.co/5dbbj8ciVx pic.twitter.com/oleHB9n0oz
— IMF (@IMFNews) September 6, 2026
But non-tariff barriers are only part of the explanation for ASEAN's relatively low intra-regional trade. Research from the region points to a broader combination of industrial structure, national competition, infrastructure, standards, services and the way foreign investment is embedded in local economies.
The question for ASEAN is therefore changing. It is no longer simply whether the region can reduce barriers to trade. It is whether the production networks already operating across Southeast Asia can generate more trade, investment and value within ASEAN itself.
A production network without a comparable regional market
ASEAN's integration model differs significantly from that of the European Union. The IMF describes ASEAN as having developed a shared production line rather than a shared market. Components can move between several ASEAN economies before being incorporated into products that are ultimately sold to customers outside Southeast Asia.
That model has delivered substantial benefits. It has allowed individual ASEAN economies to specialise in different stages of production, attract multinational manufacturers and become increasingly important nodes in global value chains.
It also leaves the region exposed to demand and policy changes beyond Southeast Asia. When major external markets slow or trade restrictions increase, the effects can travel through the same production networks that previously supported ASEAN's growth.
A stronger regional market could provide an additional source of demand and resilience without requiring ASEAN to reduce its engagement with global markets. The objective would not be to replace external trade, but to add a deeper regional economic layer to an already highly internationalised production system.
Tariffs have given way to a more complicated trade problem
ASEAN has made substantial progress in reducing conventional tariffs through the ASEAN Trade in Goods Agreement, or ATIGA. ASEAN says that as of 2025 the region was virtually tariff-free, with tariffs on around 98.86% of products fully eliminated under ATIGA.
The more detailed tariff picture is important. ASEAN's official investment-promotion platform says the six original ASEAN members had eliminated intra-ASEAN import duties on 99.65% of their tariff lines, while Cambodia, Laos, Myanmar and Vietnam had reduced duties to 0–5% on 98.86% of their tariff lines.
That progress helps explain why the next trade challenge is increasingly regulatory rather than simply tariff-based.
Different technical standards, product requirements, certification procedures, sanitary and phytosanitary rules, licensing requirements and customs procedures can increase the cost and complexity of doing business across several ASEAN markets even when the formal tariff is zero.
These costs can be particularly significant for smaller firms. A large multinational may be able to absorb the expense of meeting different national requirements, while a smaller company may conclude that entering another ASEAN market is not commercially worthwhile.
ASEAN has consequently placed greater emphasis on non-tariff measures and trade facilitation. The upgraded ATIGA is intended to deepen and widen economic integration and strengthen regional supply chains, while ASEAN continues to work on customs, standards and other measures affecting cross-border trade.
The second ATIGA protocol was signed in December 2025 and, under ASEAN's agreement database, is not yet in force; the protocol provides for entry into force 18 months after signature, subject to the required domestic procedures.
The implementation of those commitments may therefore be as important as the commitments themselves.
Trade follows production
Non-tariff barriers, however, do not provide the complete explanation. Research by Malaysia's Khazanah Research Institute argues that the relatively low level of intra-ASEAN trade is not principally a tariff problem. Its analysis focuses instead on the organisation of production and the role of major manufacturing hubs in generating demand for suppliers across borders.
The distinction is important. Trade agreements can make it easier for companies to trade, but they do not by themselves create companies that need to trade. A major final-product manufacturer can act as a hub, drawing component makers, specialised suppliers and service providers into a regional network. Those suppliers then generate additional cross-border trade.
Where such hubs are limited, tariff reductions may have a smaller effect because there is less production-related demand for regional inputs.
KRI's analysis therefore points to the importance of developing more complex manufacturing and stronger production hubs. ASEAN economies already possess different industrial capabilities, creating the possibility of complementary regional production rather than simply parallel national industries.
This also changes the way ASEAN's foreign-investment success should be viewed. More factories and larger export figures do not automatically mean deeper regional integration.
For example, a multinational company may establish an assembly operation in one ASEAN economy while sourcing a substantial share of its components from outside the region and exporting the finished product to markets elsewhere.
Such investment can still create jobs, exports and valuable capabilities. But its broader regional impact depends partly on whether it develops local suppliers, skills, technology and services.
National competition can work against regional integration
This creates one of ASEAN's most difficult contradictions. ASEAN governments have strong reasons to compete for investment. Advanced manufacturing projects can bring employment, exports, technology and strategic capabilities, while industries such as semiconductors, electric vehicles and batteries have become increasingly important to national industrial strategies.
But when several countries seek the same investment and develop similar export industries, national competition can weaken incentives for regional coordination.
A September 2026 commentary by the S. Rajaratnam School of International Studies argues that intra-ASEAN non-tariff barriers are proliferating despite the region's extensive trade agreements. It links part of the problem to members producing similar products for export and losing sight of the collective value ASEAN can offer to external partners.
That does not mean national industrial policies are inherently inconsistent with ASEAN integration. The issue is whether competition produces complementary capabilities or encourages several countries to reproduce the same production capacity.
If production networks become more specialised and interconnected, an investment decision in one ASEAN economy can generate demand and opportunities in several others. If countries instead seek to localise entire supply chains within their own borders, the potential for intra-regional trade can diminish.
ASEAN's challenge is therefore partly institutional: its members are simultaneously national competitors and participants in a common economic project.
Investment is already building the network
The foundations for deeper integration are nevertheless substantial. The ASEAN Investment Report 2025, prepared by the ASEAN Secretariat and UN Trade and Development, recorded $226 billion in FDI into ASEAN in 2024, an increase of 8% despite an 11% decline in global flows. Manufacturing FDI rose sharply, reaching $44 billion, while supply-chain-intensive industries and the were major drivers of investment.
The report also identifies semiconductors, automotive and apparel as important supply-chain-intensive sectors and describes ASEAN as an increasingly important global supply-chain hub.
Semiconductors provide a particularly clear example. ASEAN has developed significant capabilities in assembly, testing and packaging, while major global companies operate across multiple member states. Automotive production similarly involves manufacturing and supplier networks spread across the region.
The region therefore does not need to create cross-border production networks from scratch. They already exist.
The more difficult question is how much value those networks generate within ASEAN and how deeply local firms are connected to them.
This is why the quality and structure of investment matter alongside its volume. The ASEAN Investment Report itself identifies infrastructure and logistics capacity, port congestion, trade finance and mutual recognition of standards and certifications among the constraints that need to be addressed to sustain supply-chain development.
An investment that creates regional suppliers, research capabilities, skilled employment and technology transfer can strengthen the foundations for further intra-ASEAN trade. An isolated export platform may contribute much less to the development of a broader regional market.
Infrastructure and standards determine whether integration works
Production networks require infrastructure capable of connecting them. A company deciding where to locate a factory considers more than tariffs. It needs reliable ports and roads, efficient customs procedures, competitive logistics, dependable energy, digital connectivity and predictable regulations.
Standards can be equally important. Differences in technical specifications, safety requirements, testing and certification can force companies to repeat procedures in multiple markets. Such costs may be particularly significant for smaller firms that lack the resources of multinational corporations.
This is why trade facilitation and regulatory harmonisation are not peripheral issues. They determine whether formal market access becomes commercially usable market access.
The upgraded ATIGA, along with initiatives such as the ASEAN Single Window, customs transit arrangements and other trade-facilitation mechanisms, is intended to make cross-border commerce more efficient.
The effectiveness of these mechanisms will ultimately be measured not by the number of agreements signed but by whether businesses experience lower costs, greater predictability and fewer administrative obstacles when trading across ASEAN borders.
Services are part of the same equation
A stronger regional market cannot be built around goods alone. Modern manufacturing increasingly depends on transport, logistics, finance, telecommunications, information technology, professional services, design, maintenance and research. If those services remain segmented by national regulations, companies may find it difficult to build truly regional operations even when goods can cross borders relatively easily.
ASEAN has been pursuing services liberalisation for decades. The region is now also moving deeper into digital integration, with negotiations for the ASEAN Digital Economy Framework Agreement concluded in 2026. ASEAN describes DEFA as a major step towards a more open, rules-based and connected regional digital economy.
The digital economy could reduce transaction costs for cross-border commerce and make it easier for businesses, including smaller enterprises, to reach customers and suppliers elsewhere in ASEAN. ASEAN documents say DEFA could help create the conditions for the potential value of the regional digital economy to rise from about $1 trillion to $2 trillion by 2030.
But digital integration cannot substitute for physical and industrial capacity. A digital agreement can make a cross-border transaction easier; it cannot by itself create the ports, power systems, industrial clusters and supplier capabilities needed to sustain regional production.
The two forms of integration therefore reinforce rather than replace each other.
A stronger ASEAN market should complement global markets
There is also a danger in interpreting the case for greater intra-ASEAN trade as an argument for reducing the region's dependence on external markets altogether.
ASEAN's global orientation is one of its principal economic strengths. Its economies are deeply connected to China, the United States, the European Union, Japan, South Korea and other markets. Those relationships provide access to capital, technology, consumers and production networks that have helped transform Southeast Asia into a major manufacturing and investment destination.
The objective, therefore, should not be de-globalisation. A larger regional market would instead give ASEAN another source of demand and another channel for investment and production. That could become increasingly valuable when external trade is affected by tariffs, geopolitical tensions, weak demand or disruptions in global supply chains.
IMF analysis has also highlighted ASEAN's exposure to geoeconomic fragmentation because of the region's strong trade links with China and advanced economies. Its research suggests that deeper fragmentation could impose significant long-run costs on highly open ASEAN economies.
That makes a stronger regional market potentially complementary to, rather than a substitute for, ASEAN's global economic links.
From more trade to more regional value
The central question is therefore not whether ASEAN should trade more with itself simply for the sake of increasing the intra-regional trade ratio.
A higher percentage would be meaningful only if it reflected deeper economic integration. That could involve more ASEAN firms supplying regional manufacturers, more investment connecting production across member states, greater cross-border services activity, more compatible standards and regulations, better logistics and stronger participation by local companies in regional value chains.
The distinction matters because trade statistics measure transactions, not necessarily the depth of economic development behind them.
A supply chain can generate billions of dollars in cross-border trade while leaving key technologies, intellectual property and high-value services concentrated outside the region. Conversely, a smaller increase in trade could have a larger developmental effect if it strengthens local firms and allows more value to be retained within ASEAN.
This is where the industrial argument raised by KRI complements the IMF's analysis of non-tariff barriers. Removing barriers can make regional trade easier; developing stronger production hubs and supplier networks can create more reasons for companies to trade regionally in the first place.
The next phase of ASEAN integration
ASEAN's economic success has changed the scale of the question. A $4.5 trillion bloc of about 700 million people growing at more than 4.5% annually has the potential to generate substantially more demand, investment and production within its own borders.
But its relatively low intra-ASEAN trade share does not by itself demonstrate that its integration model has failed. Much of that integration is embedded in global production networks, and those networks have been an important source of ASEAN's growth. The more significant question is whether ASEAN can build on that achievement.
The IMF's 4.3% estimate highlights the potential gains from tackling non-tariff barriers. KRI's research points to the importance of industrial structure and production hubs. RSIS highlights the tensions created by national competition and regulatory fragmentation. ASEAN's own initiatives point towards deeper work on trade facilitation, standards, services and digital integration.
Taken together, these perspectives suggest that ASEAN's next trade challenge is broader than another round of tariff reductions.
The region has already demonstrated that its economies can operate as parts of a common production system. The next test is whether they can capture more of the value created by that system within ASEAN — while remaining fully connected to the global markets that helped make Southeast Asia one of the world's most important economic regions.
