A $27 Trillion Europe Could Redraw the World Economy
A Europe stretching from the Atlantic economies to Ukraine would rival the United States in scale. Its decisive test would be whether it could turn continental size into a single efficient market.
Imagine the world economy divided into four large, mostly closed systems. The United States trades mainly with itself. China does the same. Russia is treated separately. The fourth system is a much larger European economic area: the EU's 27 members plus Britain, Switzerland, Norway, Iceland and Liechtenstein, the Western Balkans, Moldova and Ukraine.
It is an artificial experiment, but a useful one. It strips away day-to-day trade flows and asks a more structural question: which bloc has enough consumers, capital, industry, energy, technology, food production and political capacity to function as something close to an economic world of its own?
On current numbers, enlarged Europe would be enormous. World Bank data put the EU's 2025 nominal GDP at about $21.24 trillion and Britain's at just over $4 trillion. Add Switzerland, Norway, Ukraine, the Western Balkans, Moldova, Iceland and Liechtenstein and the total approaches $27 trillion. The population would be around 590 million. That would leave the bloc smaller than the United States in nominal dollar output, but substantially larger than China on that measure and more than ten times Russia's economy.
The point is not that a map can create prosperity. It cannot. The more interesting conclusion is that Europe already possesses nearly all the ingredients of a super-economy, but they sit inside partially separated political and financial systems.
The existing single market demonstrates the advantage of scale. It gives roughly 450 million consumers access to a common space built around the movement of goods, services, capital and people. Norway, Iceland and Liechtenstein already participate through the European Economic Area. Expanding the architecture westward to Britain and Switzerland and eastward through the Balkans, Moldova and Ukraine would create a market large enough to support whole industrial ecosystems without relying on any one national customer base.
Manufacturing would be unusually diversified. Germany and Central Europe bring dense industrial supply chains. Italy adds machinery, design and specialised manufacturing. France contributes aerospace, nuclear expertise and a major agricultural base. Britain brings finance, professional services, universities, defence and life sciences. Switzerland adds pharmaceuticals, precision engineering and another global financial centre. The Nordics contribute energy, industrial technology and sophisticated digital infrastructure.
Ukraine would be economically small beside the established western economies, with 2025 nominal GDP of roughly $214 billion. But its importance is not captured by that number. It sits on the eastern side of Europe's transport, agricultural, energy and security geography. Rebuilding it would also be one of the largest investment programmes in modern European history. The latest joint reconstruction assessment puts ten-year needs at almost $588 billion.
That bill can be read in two ways. It is a formidable fiscal burden if reconstruction is treated mainly as a transfer to repair destroyed assets. It becomes something different if roads, railways, electricity grids, housing, industrial parks and logistics are built to integrate Ukraine directly into the wider European market. In that case a large share of the money becomes capital formation inside the bloc.
The financial system may be the area where enlargement produces the biggest theoretical gain. Europe is rich, but its capital is fragmented. London, Paris, Frankfurt, Amsterdam, Milan and Zurich are major centres, yet they do not operate under one fully unified securities, tax, insolvency and supervisory framework. The European Commission estimates that deeper capital-market integration could allow European companies to raise about €470 billion in additional financing.
A continental system that brought London and Zurich into a more integrated architecture would therefore gain something more valuable than another few percentage points of GDP. It would gain a better mechanism for turning savings into productive investment. That matters for artificial intelligence, energy grids, semiconductor capacity, biotechnology, defence manufacturing and the thousands of mid-sized firms that make up Europe's industrial base.
This is also why the United States remains the strongest benchmark. America combines a continental consumer market with one federal Treasury market, one central fiscal authority, very deep capital markets, globally dominant technology firms, abundant energy and a single strategic command structure. Europe can match or exceed parts of that portfolio, but it does not yet combine them as efficiently.
China presents the opposite comparison. It is larger in purchasing-power terms and has unmatched manufacturing scale, enormous infrastructure capacity and a central state able to direct investment rapidly. Yet its demographic trajectory, capital controls and political structure create different constraints. An enlarged Europe would not beat China simply by becoming larger. Its advantage would be a broader mix of high-income consumers, institutions, industrial know-how and globally connected financial centres.
Energy shows both the opportunity and the limit of the experiment. Norway inside the system materially improves the balance. France's nuclear fleet, Nordic hydro, North Sea wind, Iberian solar resources and a highly interconnected electricity market make the region more resilient. But Europe would still depend on outside suppliers for important raw materials, parts of its hydrocarbon supply and several strategic minerals. No realistic European map creates complete autarky.
Defence has become part of the economic calculation as well. EU member states spent €418 billion on defence in 2025, according to the European Defence Agency, with the figure projected to reach €454 billion in 2026. Add Britain and Norway and the financial and industrial base becomes larger still. France and Britain would place Western Europe's two nuclear powers inside the same strategic economic project.
But here, too, spending is not the same as output. Fragmented procurement, competing national requirements and duplicated systems can make a large budget less effective than a smaller but unified one. The same problem appears in capital markets, energy policy and digital regulation.
Ukraine's accession process is therefore more important than a ceremonial expansion of borders. In June 2026 the EU opened the fundamentals cluster in accession talks, followed in July by the external-relations cluster. These negotiations reach directly into the machinery that determines whether an economy can participate in the single market: courts, public administration, procurement, statistics, financial control, foreign policy and security.
A union approaching 590 million people would also inherit Europe's demographic problem rather than solve it. Enlargement can add workers, consumers and younger regions, but it cannot by itself reverse ageing. Productivity, migration policy, automation and labour mobility would still determine how much output each worker can generate.
So would this enlarged Europe become the most economically efficient bloc on earth?
Not automatically. The United States would still begin with simpler federal decision-making and deeper unified capital markets. China would retain a larger purchasing-power economy and extraordinary industrial scale. Europe would carry the cost of reconstruction in Ukraine, regional income gaps and the political difficulty of reaching agreement among more than 30 democracies.
Yet the thought experiment identifies an unusual possibility. Europe is one of the few regions that could add scale without starting from institutional emptiness. It already has a single-market legal order, cross-border infrastructure, shared regulation, monetary union for many members and a long history of making previously national systems interoperable.
If enlargement merely adds flags, vetoes and transfer payments, the bloc could become bigger while remaining slower. If it is paired with a genuinely deeper market for capital, energy, services, defence procurement and technology, the result could be one of the most complete economic systems ever assembled.
The strongest political project in history would therefore not be created by territory alone. It would be created by a mechanism capable of converting Europe's diversity into scale without destroying the competition, local knowledge and institutional trust that made its richest economies productive in the first place.
That is the real test. A $27 trillion Europe has enough mass to stand beside the United States and China. Whether it can behave like one economy is the question that decides whether it becomes merely a very large union or something much closer to a separate economic planet.
