The clearest sign that something has gone badly wrong for London came not from an economist or a government report. It came from an American tech company, quoted in a Financial Times investigation, explaining why it had expanded its operations in the city.
PhD students in San Francisco, the company said, cost at least double what they do in London. London has so much human capital. And they are so cheap.
That is the pitch now. Not prestige. Not proximity to power. Not the gravitational pull of the world's great financial capital. The pitch is: come here because the talent is affordable.
One panellist on a recent Institute of Economic Affairs podcast drew the inevitable comparison. British actors are overrepresented in Hollywood, goes the joke, because they are like "white Mexicans" - they are really cheap by American standards now. It was meant to be funny. It is also, increasingly, an economic strategy.
What was happening before
For most of the past two decades, London was the engine of the British economy. Not in a vague, feel-good way - in a measurable, documented way. The city accounts for roughly 15% of the UK's population and around 25% of its economic output. Its productivity - meaning the value each worker generates per hour - was consistently the highest of any UK region, often by a substantial margin.
Productivity measures how much output an economy produces for each unit of labour or capital. When productivity rises, wages and living standards can rise alongside it without stoking inflation. When it falls, the whole system tightens.
Cities generate productivity gains through what economists call agglomeration effects - the way that putting large numbers of skilled, specialised people in close proximity generates ideas, connections, and economic activity that would not happen in isolation. A biotech researcher who happens to meet a data scientist at a conference. A fintech startup that can recruit a compliance lawyer and a software engineer from the same street. These interactions require density.
London had that density. It attracted highly educated workers from across the UK and the world, it built clusters of specialised industries - finance, law, tech, creative sectors - and it generated a wage premium that made the brutal cost of living there feel, if not comfortable, at least rational.
That model started breaking down, and it broke down slowly enough that nobody noticed until the data made it impossible to ignore. Between 2019 and 2023, London was the only UK region to record a decline in productivity, falling 1.1% while the rest of the country, growing slowly, at least grew. The engine had stalled.
What is actually happening
The IEA podcast, drawing on a detailed Financial Times investigation, picks through the wreckage.
London's population growth has slowed sharply. In the run-up to the 2012 Olympics - not exactly a golden era, given it coincided with the global financial crisis - the city's population grew by roughly 8% over five years. Over the most recent five-year period, that figure fell to 2%. More striking still: in terms of British nationals, London is now a net exporter of people. More Britons are leaving than arriving.
Some of the causes are structural and well-documented. Housing is the most obvious. Supply restrictions - worsened recently by new building safety regulations that make it harder to construct flats - have kept prices and rents at levels that make London an increasingly poor proposition for working-age people who do not already own property. According to Centre for Cities analysis, the median earnings of Londoners after housing costs are no longer significantly higher than in the rest of the UK - meaning the wage premium that once justified the cost has been almost entirely eaten by rent for those who do not own.
Then there is the marginal tax problem. A worker with a student loan earning between £100,000 and £150,000 - a salary that would put them in the upper tier of high-productivity industries like tech, finance, or consulting - faces a marginal tax rate of around 71%, once the student loan repayment taper interacts with income tax and national insurance. That is not a theoretical edge case. It is the effective tax rate on success for a significant slice of London's most productive potential workforce, and it actively discourages people from taking on higher-skilled, higher-earning roles.
The pandemic accelerated trends already in motion. Remote working reduced the density that made London productive. Fewer people commuting to the office means fewer informal meetings, fewer serendipitous connections, fewer of the agglomeration effects that justified the city's premium wages.
And then there is the non-dom question. A non-dom is a UK resident who, under old rules, could claim their primary domicile was overseas and therefore avoid paying UK tax on income earned abroad. The regime attracted wealthy international residents - financiers, entrepreneurs, global executives - who spent money in London and contributed to the economic ecosystem, even if their tax contribution was modest. The UK has actively wound that down, and according to the State of London Report 2025, compositional changes in who is arriving and leaving have compounded the city's productivity problem.
The money trail
The IEA podcast surfaces a tension that runs through British economic policy without ever quite being resolved: London's productivity matters for the whole country, and the policies that have damaged it were, in most cases, national policies applied uniformly.
Building safety regulations that make it harder to construct flats. Student loan repayment structures that create absurd marginal tax rates for high earners. Changes to the non-dom regime. The gradual erosion of the wage premium through unchecked house price inflation. None of these were aimed specifically at London. All of them hit London disproportionately.
The result is a city that is, by UK standards, still the most productive region - but one that is no longer growing in productivity terms. And the gap between London and comparable global cities is, according to Centre for Cities research, substantial: London's productivity stagnation cost the UK economy an estimated £54 billion in 2019 alone, the equivalent of two Edinburghs.
This is where the American tech company quote lands with such uncomfortable force. The reason London is attracting investment from firms that need large numbers of educated workers is not that London has become more dynamic. It is that the UK has become poor enough, relative to the US, that British talent now undercuts American talent on cost. London is competing with other cheap locations - not with New York, Singapore, or Zurich.
That is a valid competitive position. Low costs can attract investment. But it is a very different story from the one London was telling a decade ago, and it depends, structurally, on wages staying depressed relative to a booming US labour market. If US wages stop rising, or if the dollar weakens, the arbitrage disappears.
The podcast also makes a pointed observation about the UK government's cost of living response, which arrived this week in the form of the "Great British Summer Savings" scheme. Chancellor Rachel Reeves announced that VAT on children's meals, cinema tickets, and entry to attractions like zoos and theme parks will be cut from 20% to 5% between June 25 and September 1 - a window of just over two months, estimated to cost the Treasury around £300 million.
VAT, or value added tax, is a consumption tax applied to most goods and services in the UK at a standard rate of 20%. Reducing it is meant to lower prices for consumers.
The IEA analysts are unimpressed, and not just on ideological grounds. The evidence from previous VAT cuts - including when the previous government removed VAT from tampons and ebooks - shows very limited pass-through to consumers in the short term. It can take years for a reduction to filter through to retail prices, if it happens at all. A study from Finland found some evidence of pass-through when VAT on haircuts was briefly cut, but that is a narrow, well-defined service sold direct to consumers. A children's restaurant meal, defined by government guidance as a meal "held out for sale only as a meal for children" with a marketing test rather than a portion-size test, is a category that will keep tax lawyers busy for the entire summer.
The government has also published detailed guidance on what counts as a qualifying children's meal - specifically, a meal marketed and priced as intended for children. As the podcast notes dryly, there is very little economic incentive for restaurants to overhaul their pricing systems for a policy that expires in nine weeks.
What people are doing about it
The responses playing out are, broadly, three kinds.
The first is the government doing things. Tariff cuts on around 100 imported goods - confirmed this week alongside the VAT package - are the one measure analysts across the spectrum have broadly welcomed. Reducing import tariffs lowers the cost of goods directly, and the UK has been slow to use this lever since Brexit. Bloomberg reported the political backdrop: Wes Streeting, the former Health Secretary now positioning himself for a potential run at the Labour leadership, proposed equalising capital gains tax rates with income tax rates - up to 45% for the highest earners - branding it a "wealth tax that works." The IEA panellists acknowledge this is not actually a wealth tax in any technical sense (it avoids the nightmarish valuation problem of taxing what people own rather than what they sell), but warn it would discourage risk-taking investment and encourage tax evasion without offsetting cuts elsewhere, such as to stamp duty.
The second is businesses adapting to uncertainty. Grant Thornton has already published guidance for hospitality operatorson how to navigate the VAT cut rules - noting that the way supplies are packaged, described, and sold will be critical, and that businesses need to move quickly. The practical reality for most small restaurants is that reprinting menus, retraining staff, and updating accounting systems for a nine-week window is probably not worth the administrative cost.
The third is skilled workers continuing to vote with their feet. The net outflow of British nationals from London is not a dramatic crisis moment - it is a slow, persistent recalibration. Some move to other UK cities. Some leave the country entirely. The structural problems - housing costs, marginal tax rates, the grinding sense that London extracts more than it returns for workers who do not own property - have not changed this week.
The bottom line
London is still the UK's most productive city by a wide margin. But it stopped growing in productivity terms at the exact moment the rest of the country, slowly, started to grow. The causes - housing supply, tax structure, post-pandemic office patterns, the departure of wealthy international residents - are well understood and mostly the product of national policy decisions. The government's response this week is a mix of one good measure (tariff cuts) and one that will not work as advertised (a nine-week VAT cut that evidence suggests will not reach consumers). Meanwhile, the city's new competitive pitch - cheap, educated, English-speaking - is real, but it is a different kind of pitch. It is the pitch of a city that has been repriced, not one that has been fixed.
Timeline
- 2007-2012 - London's population grows by approximately 8% over five years, even during the global financial crisis, reflecting the city's strong agglomeration pull.
- 2007-2019 - London's productivity growth flatlines while the city creates 1.2 million extra jobs; Centre for Cities estimates productivity stagnation cost the UK economy £54 billion in 2019 alone.
- 2019-2023 - London becomes the only UK region to record a fall in productivity, declining 1.1% while national productivity grows slowly.
- March 2023 - Centre for Cities publishes analysis showing London's wage premium after housing costs has been largely eroded for renters.
- 2024-2025 - New building safety regulations tighten restrictions on flat construction in London, further constraining housing supply.
- May 21, 2026 - Wes Streeting proposes equalising capital gains and income tax rates, branding it a "wealth tax that works", estimated to raise £12 billion annually.
- May 21, 2026 - Chancellor Rachel Reeves announces the "Great British Summer Savings" scheme, cutting VAT on children's meals and attractions from 20% to 5% between June 25 and September 1, 2026, at an estimated cost of £300 million.
- May 22, 2026 - The IEA publishes a podcast discussing the Financial Times investigation into London's decline, the VAT cut, and Streeting's capital gains proposal.
Summary
Who: London workers, British employers, the UK government, American tech companies operating in London, and Labour leadership contender Wes Streeting.
What: London's population growth has slowed sharply, British nationals are leaving the city in net terms, and productivity fell 1.1% between 2019 and 2023 - the only UK region to decline. The government responded with a nine-week VAT cut on children's meals and attractions as part of its cost of living package. Separately, Streeting proposed aligning capital gains tax with income tax rates up to 45%.
When: The productivity decline spans 2019 to 2023; the VAT cut runs June 25 to September 1, 2026; the capital gains tax proposal was floated on May 21, 2026.
Where: London, primarily, with national policy implications across the UK.
Why: Housing supply restrictions, a student loan structure that creates 71% marginal tax rates for high earners, the end of the non-dom regime, and the post-pandemic shift to remote work have collectively eroded the agglomeration advantages that made London productive. The government's short-term response addresses symptoms rather than causes.