In seven days, the British will decide. The referendum on EU membership marks an historic moment. At stake is Britain’s often troubled relationship with Europe, but also the coherence of the west. A vote to withdraw would be irrevocable, a grievous blow to the post-1945 liberal world order. David Cameron’s referendum gamble has proved to be a futile attempt to heal divisions in the ruling Conservative party. The campaign has split the country. Emotions have trumped facts. Born-again populists rail against the establishment. “People in this country have had enough of experts,” declares Michael Gove, a leading Brexiter, justice secretary (and former education secretary).

This newspaper has supported British membership of the EU from the outset in 1973. The Financial Times does not favour membership of the single currency. It makes no economic sense. But opting out of the euro is quite different from opting out of the EU, which would seriously damage the UK economy. Constructive engagement is vital when Europe confronts threats from Islamist extremism, migration, Russian aggrandisement and climate change. These can only be tackled collectively.

The referendum campaign is a contest between competing values: between liberal internationalism and a pinched nationalism, between an open-trading system and marginalisation. This is why Britain’s allies, from Australia to Japan and the US, have unanimously supported Remain — and why Marine Le Pen and Donald Trump favour Brexit.

The debate has been depressingly transactional. The economic costs of withdrawal are substantial; but the Remain camp has indulged in pocketbook scaremongering. The Leave camp has been superficially patriotic, at heart mendacious. Britain does not contribute a net £350m a week to the EU budget. Savings will not go automatically to the National Health Service. Turkey has about as much chance of joining the EU by 2020 as Istanbul being renamed Constantinople in a revived Byzantine empire.

To be sure, Leave’s focus on immigration resonates with voters. This may account for a tightening of the polls, to the point where Brexit is a real risk. The influx of EU migrants, far greater than successive governments predicted, has stirred fears about jobs, public services and British identity. “Take back control” in the name of democracy is a seductive slogan in the age of globalisation. Mr Cameron has yet to provide an adequate riposte.

He joins a long line of British prime ministers, including Margaret Thatcher and Tony Blair, who have failed to level with the British public. Membership of the EU and, crucially, the single European market, entails some transfer of sovereignty in return for an actual gain in power as part of a greater whole. The rewards are indisputable. Since Britain joined the EU in 1973, real gross domestic product per head has grown faster than in France, Germany and Italy. Thatcher’s labour reforms and the Bank of England’s independence were vital too. But membership of the single market has been a magnet for foreign direct investment, funding a bulging current account deficit and guaranteeing British jobs.

Leave has failed to spell out the serious risks of life outside the EU. Boris Johnson, the former mayor of London with one eye on Mr Cameron’s job, invokes a newfound freedom without the pettifogging rules of the single market. With one bound, Britain would become the Venice of the 21st century. In the real world, Britain would have to redefine fundamentally its relationship with the EU. An arrangement akin to Norway’s would require paying into the EU budget and accepting free movement of labour. Switzerland’s deal is even more cumbersome. Mr Gove invokes a model closer to Albania, Bosnia, Serbia and Ukraine, to deserved derision. The fallback — relying on World Trade Organisation rules — would involve tariffs on UK goods, a poor deal on services (vital for the City of London) and years of fraught negotiations. Britain would end up a rule-taker, not a rule-maker.

Britain’s seat at the table has allowed it to win big arguments in Brussels: on free trade, liberalisation of air travel and telecoms, and EU enlargement to central and eastern Europe. The UK has shaped membership to its needs, securing opt-outs from the euro and the Schengen agreement abolishing border controls. It retains control of income tax and corporate taxation. Education, skills and a skewed housing market hold the UK economy back, not a Brussels bureaucracy the size of Birmingham city council.

In a multi-speed, multi-tiered EU, the European superstate is a chimera. Brexiters such as Nigel Farage, the leader of the UK Independence party, see British withdrawal as a handy act of sabotage, hastening the disintegration of the EU. To what end? In or out, Britain would pay a heavy cost. Brexit would reintroduce a border between north and south in Ireland. It would put the territorial integrity of the UK at risk, especially if an independent-minded Scotland overwhelmingly votes to stay. It would trigger a political crisis in the UK — Mr Cameron would surely go — and reawaken the ghosts of nationalism in Europe.

The positive case for Britain in the EU is easily made. To abandon the cause of constructive reform of an admittedly imperfect EU would be more than defeatist. It would be a gratuitous act of self-harm. Business leaders have a duty to spell out the cost of leaving before it is too late.

In 1975, when a Labour government called for a referendum on British membership of the European Economic Community, the FT rejected the notion of Britain as “a tight little island, seeking refuge in a siege economy, opting out of the main stream of world politics”. The sentiment remains resonant today. This is no time to revert to Little England. We are Great Britain. We have a contribution to make to a more prosperous, safer world. The vote must be “Remain”.

Letters in response to this editorial:

Another vehicle like Trump and Le Pen / From Guy Wroble

Referendum has been good for business and unions / From John Barstow

Postwar vision that has stood the test of time / From Kelsey van Musschenbroek

EU project must go back to first principles / From C R Cann

The best so far / From Hugh Wotherspoon

Negativity over Turkey’s accession is deplorable / From Tansug Ok

Our entrepreneurial future depends on remaining / From Lloyd Dorfman

Lack of solution that gave Leave its force / From James Craigen

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