Brexit, 10 Years On: A Reckoning With the Economic Cost
Nearly ten years have passed since British voters narrowly decided to leave the European Union — a watershed moment that reshaped the country's political and economic trajectory. The referendum, held in June 2016, saw 52% of voters choose to exit, driven by calls for greater sovereignty, tighter immigration controls, and the promise of billions saved in EU membership fees. Proponents argued that freedom from Brussels bureaucracy would allow the UK to strike more favorable trade deals on its own terms.
Yet almost immediately after the result, financial markets convulsed, and a wave of “buyer’s remorse” set in. As this columnist wrote at the time, the economic fallout would “likely be decidedly negative for the UK,” adding that many voters “had absolutely no idea the effects that their votes would have.” That assessment has proved prescient.
More than a decade later, the data paints a stark picture. A comprehensive study from the Stanford Institute for Economic Policy Research estimates that by 2025, Brexit had reduced UK gross domestic product by between 6% and 8% relative to a counterfactual scenario without withdrawal. Investment fell 12% to 18%, employment dropped 3% to 4%, and productivity slipped 3% to 4%. Because the formal split did not take effect until December 2020, these figures are expected to widen as the long-term costs compound.
To be sure, other factors — including the COVID-19 pandemic, energy price shocks, and fiscal and monetary policy shifts — have also weighed on UK growth. But the isolation caused by leaving the bloc introduced a unique layer of uncertainty and disruption. The loss of frictionless access to the EU’s single market, the end of free movement of labor, and the reimposition of customs checks all imposed real economic drag.
The parallels with recent U.S. trade policy are worth noting. Just as the UK walked away from a large and powerful trading bloc, Washington has withdrawn from multilateral trade agreements and erected tariff barriers. The U.S. has also tightened immigration — another echo of the Brexit playbook. Both approaches risk curbing the cross-border flows of goods, capital, and people that have long underpinned economic dynamism.
In a world already grappling with wars, energy volatility, and demographic aging, self-inflicted wounds to trade integration are especially costly. The EU was far from perfect for the UK — no arrangement is — but the evidence suggests that going it alone has measurably diminished prosperity. As other nations consider similar paths of economic nationalism, the British experience stands as a sobering data point.