Not exactly. In fact, the UK may well end up losing the predicted 2-3 per cent of gross domestic product (GDP) from Brexit. But it is the exit from the single market, not the initial vote to leave, that will bring those losses, and that may happen over a long period.
This could be very good news for the UK. With a weaker currency, the country will benefit from an increase in export competitiveness that could offset those incremental losses and the transient investment weakness that is likely to arise.
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Other factors will also cushion the blow of Brexit. Over the last two decades, the UK has transformed its economy to foster unprecedented specialisation in services. In the mid-1990s, goods exports were three times as important as services exports, and the majority of British exports went to the EU. Nowadays, the UK exports mostly services - and mostly to non-EU markets.
As a result, the internal market for goods is far less important for the UK today than for EU countries. The value-added contained in British goods exports to the EU accounts for only about five per cent of GDP - several times less than for, say, Germany. Meanwhile, Britain's non-EU exports account for about seven per cent of GDP.
The shift in UK goods exports away from the EU reflects a change in the sources of economic growth, with Asia, in particular, gaining primacy. To some extent, other EU member states have also shifted their goods exports away from Europe, but the effect has been most pronounced in the UK.
The fact that the UK now relies more heavily on access to world markets than on the EU's internal market surely contributed to the Brexit vote, as it minimised the sacrifice the UK would have to make to regain control over issues like immigration.
This is where the Brexit bet becomes riskier. To be sure, approving trade deals will be much easier for the UK than it is for the EU, which requires agreement from 30 parliaments. The political challenges that have impeded the approval of a relatively low-profile free-trade agreement with Canada exemplify this challenge. But the UK will also have less leverage in negotiations than the EU does.
Similarly, the UK does not have to fear huge changes in its ability to export services to the EU, which currently accounts for about 40 per cent of the UK total, because the EU's internal services market already is far from open. But there is one exception: Financial services.
As it stands, financial services account for about one-third of Britain's total services exports and two-thirds of the overall services surplus that the UK needs to pay for its deficit on goods. The industry's success is the result, at least partly, of the UK's EU membership.
The specialisation of the UK economy and its external accounts toward financial services began when capital movements were liberalised under the internal market programme of the 1990s. It was accelerated with the introduction of the common currency, which, combined with the elimination of obstacles to cross-border capital flows and a global credit boom, fostered the concentration of many types of wholesale financial services in the City of London.
The financial sector has a natural tendency to form clusters, and London - where English is spoken, the legal system is efficient, labour markets are flexible, and the regulatory regime is relatively streamlined - offered substantial advantages. Add to that the EU's "passporting" system, which enables London-based banks to sell their services directly throughout the EU, and the growth of the city's financial-services sector makes perfect sense - as does the fact that citizens of London voted overwhelmingly against Brexit.
Yet, the reality is that most of the advantages that have made London a financial-services hub will remain even after Brexit. And the loss of passporting might be offset by the creation of subsidiaries or "bridgeheads" within the EU, such as Dublin, Frankfurt, or Paris. London's financial-services industry could therefore survive Brexit, though it is unlikely that it will maintain its previous vigour.
Indeed, no matter what terms the UK negotiates with the EU, it will probably have to change its growth model, probably through a modest revival of manufacturing. Given decades of decline in British manufacturing, this would be easier said than done. But, if the country doesn't manage such a rebalancing, the long-term cost of Brexit might turn out to be substantially higher than current estimates.
The expansion of the financial-services industry - which creates few, but very highly paid, jobs - has contributed to rising income inequality, which has been more pronounced in the UK than in the EU. And inequality helped fuel the widespread frustration with globalisation and the so-called "establishment elites" that carried the Brexit campaign to victory.
In this sense, one of the major economic benefits of the UK's EU membership led the British to reject the project. The question is whether the economic changes that Brexit will necessitate will produce the benefits for British workers that the "Leave" campaign promised. The answer remains far from clear.
Daniel Gros is Director of the Center for European Policy Studies.
©Project Syndicate, 2016