Google, Amazon and Starbucks would have a huge amount to lose if they reduced their commitment to Britain.

BBC: Is government too scared of Google, Amazon and Starbucks?

And if rich governments made a commitment, however distant, to opening their borders, they would quickly become more focused on addressing the growing imbalances between rich and poor nations.

ECONOMIST: Letters | The

If the euro area's governments make a credible commitment to repair their finances over the medium term, Mr Trichet should in return offer them the reward of an accommodating monetary policy.

ECONOMIST: Trichet's cachet | The