The European Union (EU) is a deep regional trading bloc with a single market, customs union, and common currency (the euro) used by 20 of its 27 member states.
The United Kingdom left the EU in 2020 (Brexit), ending its participation in the single market and customs union. Since Brexit, UK trade with the EU has faced new non-tariff barriers (customs checks, rules-of-origin requirements), and the British pound has depreciated against the euro by approximately
15%.
Proponents of Brexit argued that leaving the EU would allow the UK to sign independent trade agreements (e.g., with Australia, New Zealand, and the Comprehensive and Progressive Agreement for Trans-Pacific Partnership — CPTPP) and regain regulatory sovereignty.
A 2023 study by the UK Office for Budget Responsibility (OBR) estimated that Brexit has reduced UK long-run productivity by
4% compared with remaining in the EU.