The ongoing debate over the economic impact of Brexit has been reignited following comments by Andy Burnham advocating for the United Kingdom to rejoin the European Union, prompting renewed scrutiny of the costs and benefits involved. Analysts and economists continue to grapple with the complex implications of Brexit, which has been a subject of intense discussion since the 2016 referendum.
Recent estimates from Goldman Sachs have suggested that the UK’s gross domestic product (GDP) is approximately 6 percent lower than it would have been had the country remained within the EU. The investment bank outlined several scenarios for economic recovery tied to increased integration with the EU, ranging from partial customs union membership to full reentry. Their forecasts indicate that joining a customs union could raise GDP by around 1 percent, while participation in the single market, which would reduce non-tariff barriers and restore financial passporting, might boost GDP by 2 to 5 percent. Full EU membership could potentially yield up to a 6 percent increase.
While some experts acknowledge that Brexit has introduced trade barriers detrimental to growth, there remains debate over the magnitude and nature of the economic effects. Critics of these models caution against overly optimistic assumptions, noting that growth comparisons with other economies, such as Germany—which has also faced challenges including energy shocks—do not definitively demonstrate that Brexit incurred no costs. Some analyses suggest a realistic economic hit to the UK of around 3 percent of GDP.
However, some economists argue that these assessments fail to capture the full picture, particularly the costs associated with rejoining the EU. The European Union is not solely a trading bloc but a political union with extensive regulatory frameworks on technology, energy, and commerce. Reentry would require the UK to comply with these evolving regulations, which could have economic implications not accounted for in trade-focused models.
For instance, the UK’s approach to emerging sectors such as artificial intelligence (AI) could differ significantly from the EU’s more precautionary stance. Research has shown that regulatory constraints within the EU have delayed the deployment of AI models compared to the UK. Proposed legislation like the European Commission’s Cloud and AI Development Act aims to limit the participation of certain foreign AI developers in sensitive government work, a measure that could restrict competition and innovation.
Energy policy presents another area of divergence. The EU’s binding climate targets mandate that renewables constitute at least 42.5 percent of energy consumption by 2030, alongside efforts to reduce primary energy use in homes. Rejoining the EU would impose these requirements on the UK, potentially conflicting with domestic political positions favoring relaxed net-zero regulations.
The process of influencing EU regulations is also cited as a challenge, given the need for approval from multiple institutions and member states. This contrasts with the UK’s parliamentary sovereignty, where a government majority can more readily enact changes.
Proponents of rejoining point to benefits such as access to EU procurement markets and harmonized trade rules. Yet, some argue that these gains come with trade-offs, including restrictions on public sector sourcing decisions and tariffs affecting imports like electric vehicles.
Brexit has undeniably imposed economic costs on the UK to date. As discussions on potential reentry continue, analysts emphasize the importance of a comprehensive evaluation that includes both the economic benefits of renewed integration and the regulatory and political constraints it would entail.