Their relationship might seem prone to sibling competition, but in reality there are few traces of rivalry.
But the dynamics of rivalry in the solar cell business are as clear as a bright sunny day.
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To accomplish anything at all, Mr Samaras will have to put aside a lifetime of rivalry and rise above the politics of patronage.
That kind of rivalry, within a union of national systems sharing a common currency, would indeed stand as something both promising and distinctively European.
This tradition of rivalry is so entrenched in Washington that two blue-ribbon studies of the intelligence world have recently defended its output of overlapping analyses.
This virtuous form of rivalry helps explain why so many nations in recent years have lowered tax rates and adopted simple and fair flat tax systems.
Cagaptay, of the Washington Institute for Near East Policy, said Barzani has tried to bring the PYD and Kurdish National Council together, but evidence suggests little co-operation and plenty of rivalry.
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Just a year ago, India was an investor darling, accustomed to near double-digit gross domestic product growth and talk of rivalry with China to be the fastest-growing big economy in the world.
The shadow of nuclear rivalry between India and Pakistan is at the heart of international concern about stability in south Asia, and the nuclear issue will be pursued in more talks in London next week between Mr Singh and US Deputy Secretary of State Strobe Talbott.
Some analyses of the divisions of Zimbabwe now emphasise the rivalry of the Shona people of the north versus the Ndebele people of the south.
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Which means for now, at least, reports of this rivalry's death are greatly exaggerated.
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Their troubles in AP stem from a mixture of institutional rivalry, politics and ideology.
But there is one thing that perhaps emphasises best the arbitrariness of the rivalry.
Is this medal chase being made all the keener by a touch of sibling rivalry?
Google is determined to push its social network in the face of continued rivalry with Facebook.
Granted, there hasn't been much of a rivalry historically between the Knicks and Nets.
Some Burmese may wish that their country will not become a new cockpit of superpower rivalry.
Once training had finished, Ghotbi spoke openly about the importance of the rivalry between the two countries.
It is widely believed he was shot as part of a rivalry with label Death Row Records.
Typically they might involve the course leaders acting out scenes of sibling rivalry.
If horses were capable of sibling rivalry, then Bullet Train would surely be a candidate for the psychiatrist's couch.
Fans of the two clubs have a history of bitter rivalry but it was not clear what prompted the disturbances.
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State media coverage was restrained in advance of Mrs Clinton's arrival, with talk of a rivalry over Myanmar played down.
Though there have been widespread peace efforts, rights groups remain concerned that the underlying issue of tribal rivalry still exists.
Batman, especially, shows tremendous loyalty and belief in his friend, which will undoubtedly be the foundation of their rivalry in-game.
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By publicly saying the resignation is his own choice, Father Cito added, Pope Benedict has dispelled fears of a rivalry.
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But the Pakistan Cricket Board are concerned that the importance of the rivalry could be diminished by playing too often.
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But there is also suffocation, self-effacement, and hierarchies of status and dominance that beget humiliation, resentment, and webs of toxic rivalry.
Maps are a key element of the rivalry between the two companies.
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