This is the deal that France signed up to at Maastricht with the creation of the Single European Market.
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Germany introduced laws to make it easier to establish joint-stock companies, scrapping ancient regulations, because so many German companies were taking advantage of the single European market and incorporating in Britain.
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Landsbanki, for example, had used Iceland's membership of the European Economic Area (which gives countries access to the European single market without having to join the European Union) to develop its online banking presence.
The commission says the new domain name should be particularly useful for companies which operate across the European single market, giving them a pan-European identity on the internet.
But such limits might be hard to square with the principles of the European single market, which is meant to encourage cross-border competition.
The EU, he claims, is hurting one of our most important industries - financial services - and, secure "within the warm embrace of the European single market", giving British businesses an excuse not to develop trade with the developing economies.
And finally, I welcome the fact that Europe is determined to move forward quickly on measures to support growth and investment including by completing the European single market and making better use of European funds.
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Yet such policies indicate hostility to entrepreneurship and wealth creation and reflect the French Socialist Party's failure to recognise that the world has changed since 1981, when capital controls were in place, the European single market was incomplete, young workers were less mobile and there was no single currency.
The deputy prime minister has suggested that three million jobs "rely directly on our participation" in the European single market.
What it would actually require is both the complete changing of the entire European union Single Market Project and also the rewriting of every single double taxation treaty between every single nation.
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Another poll indicated that a majority of Germans saw the European single market as a risk to their living and working conditions.
But, during his speech, David Cameron repeatedly insisted that the European single market would be at the heart of any new treaty with Brussels, billed as the alternative to exiting the union.
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For many European officials the euro, the single market, are all there to support the European project.
Creating a single functioning market would form a single European energy champion - the European Gas Market.
Stop worrying about it though he argues for continued EU membership, hailing the value of the single market and a united European front on trade, diplomatic sanctions and the like.
The Treasury believes that the partnership with Hong Kong shows that the City has not been damaged by the perception that the UK's influence over the development of the European Union's single market has been undermined by the prime minister's recent decision to veto amendments to the EU's treaty as part of efforts to rescue the eurozone.
He stressed the government's total commitment to full engagement in the European Union and the single market.
The mergers are also the fruit of the many legal moves taken by the European Union to create a single market.
But just as the American government used the constitution's interstate commerce clause to expand its powers, so the European institutions have exploited single-market rules to extend their responsibilities into such areas as social policy, welfare and the environment.
For example, it is neither right nor necessary to claim that the integrity of the single market, or full membership of the European Union requires the working hours of British hospital doctors to be set in Brussels irrespective of the views of British parliamentarians and practitioners.
"The last thing the European economy needs now is questioning of the single market, " a senior EU official said.
Nothing better symbolises the difficulties of achieving a single market than a recent argument between the European Commission and Parliament on the one hand and Europe's banking industry on the other over the cost of sending a small credit across a national border.
Having successfully adopted a single market, the European Union is now taking on a single currency.
"Otherwise, the European Union's single market will descend into chaos, " Kroes added.
Until now the European Union's single market, though far from perfect, has been a shining example of a sustained and determined effort to bring trade barriers down and of the benefits that brings.
Even careful Mario Monti, the European commissioner for the single market, wrote a front-page leader in Corriere della Sera explaining that, if Italy is to join Europe's monetary union, the slimming down of its welfare state cannot be delayed for ever.
The Marketplace Europe debate, hosted by Richard Quest and featuring Lufthansa boss Christoph Franz, chief executive of Deutsche Post DHL Frank Appel and Financial Times International Affairs Editor Quentin Peel this weekend thrashed out the topic: Can a European single market be globally competitive?
After a report last year by Alexandre Lamfalussy, a former head of the European Monetary Institute, the European Union is trying to accelerate the process of tearing down barriers to a single capital market.
What is striking about Fresh Start's consultation document is how many of the renegotiation options it highlights involve seeking improvements to European rules, particularly relating to deepening the single market and reducing subsidies.
With such economic integration the eurozone countries would inevitably start agreeing policies that would impact on the European Union as a whole, including the single market.
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