People show consideration for others in the hope or expectation that the favour will be returned.
In return they would either get a share of the spoils or simply have the favour returned.
Now she must decide whether she will return the favour in her approach to the crisis in the eurozone.
With cloudy and unsettled conditions expected to prevail throughout, Pakistan's swing bowlers should have the elements in the favour once again.
Yet the award is justly Mr Gao's for the favour he did two decades ago in helping introduce cultural modernism to China.
Then, as the controversy over Jerry Springer began, the Sikhs returned the favour, backing Christians in their efforts to prevent the broadcast going ahead.
ECONOMIST: How complaining brings surprising groups together
Michael Tidser's free-kick shot was easily collected by Tuffey seconds before the Highlanders stretched their lead with Foran returning the favour by setting up Rooney.
The favour was repaid by United in the 21st minute when Loovens rose free to glance Shunsuke Nakamura's front-post corner past Lukasz Zaluska and put Celtic 1-0 ahead.
It will have seen how Myanmar, Asia's other pariah, has come in from the cold and is beginning to win the favour of the outside world (see article).
But in the current stagnant global economy, it is unlikely Germany - or anyone else - will return the favour and help southern Europeans export their way to recovery.
And it was the in-form 6ft 3in striker who returned the favour for Chopra to put Cardiff two goals up, firing a low cross-shot across goal which left the former Sunderland marksman with a simple tap-in.
Now he wants the favour returned.
ECONOMIST: Forecasts of an ETA ceasefire may yet prove premature
Just as the Roman Empire spread its influence across half the planet, and the artists and architects of the Renaissance showed the world what art could be, so at last, in some small way, the debt is being acknowledged and the favour returned.
As the clock ticked down it seemed as though the momentum of the contest had swung firmly in the favour of the green and gold but their hopes of emulating their exploits in 2006 by progressing from their group were effectively ended when substitute Marko Pantelic pulled a goal back for Serbia after 84 minutes.
It is particularly hard when the issues favour the other side.
If the economics favour it, the companies are probably correct, unless opponents can come up with something much more potent than the coalition that led to Keystone XL's rejection.
The odds still favour the moderate Ms Collins, who has just won endorsements from a gay group.
The odds still favour the opening of talks, if only for fear of the fallout from not opening them.
This is misguided, because the best favour America can do the world economy is to preserve economic stability at home.
The financial markets are betting that the outcome will favour the bank.
The ambassador said the embargo would favour the New Forces, arguing that they have always been able to obtain arms by illegal means, the BBC's James Copnall in Ivory Coast reports.
Professor Philip Marsh, of the Centre for Applied Microbiology and Research, Salisbury, said it should be possible to control the environment in the mouth more effectively to stop the good bacteria being killed off, and to modify the conditions that favour the growth of the harmful organisms.
That is why many in the industry favour a second approach involving the more expensive tags.
Stephen Conroy, the communications minister, openly accused the Sydney Daily Telegraph of trying to force an early election and to bring down Gillard's minority government (although his accusations that the Telegraph favour regime change pre-date the present crisis).
For the moment, the Germans favour austerity and reforms that might deliver growth down the road.
But for any economist, the shift in favour of the market is the legacy to remember first.
The largest loopholes also favour the rich, making the tax system less progressive, and encourage rampant tax avoidance.
The polling data, together with the shift in favour of the administration in Congress, pose an obvious question.
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