However, another main reason for the decline was iPhone margins, which declined from around 61% in 2009 to 51% in 2010, as per our estimates.

FORBES: Getting The Juice From Apple Earnings

Counter-terrorism officials say the main reason America has avoided another attack is that it is farther from al-Qaeda's main battlegrounds.

ECONOMIST: Unlike in America, terrorism in Europe is often home-grown

Increased communication via phone and cloud computing is another contributory factor, but the main reason for the decline is that mail sorting is becoming automated, with robots replacing people.

CNN: Dying careers and thriving careers: The jobs of tomorrow

Another reason Zimbabwe has caught the world's eye the main reason, most Africans would say is that the dispossessed farmers are white.

ECONOMIST: A memoir of Zimbabwe

Another commentary in the same paper says that the main reason for the Pope's visit is the fact that "the Croatian faithful are learning more slowly than is expected of them".

BBC: Pope's visit dominates Croatian press

But was that the main reason why I decided to stay with the device for another two years on my wireless contract?

FORBES: I Apologize To My BlackBerry

If further work by researchers supports the ideas of Mr Eppig and his colleagues, they will have done the world a good turn by providing policymakers with yet another reason why the elimination of disease should be one of the main aims of development, rather than a desirable afterthought.

ECONOMIST: Disease and intelligence

This kerfuffle served as the main reason for Chile's support of the UK during the Falklands War, another convoluted and somewhat silly conflict over a few chains of islands off the coast of Argentina that the British had long claimed as their own.

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Another reason for unionists to shy away from an independence showdown is that the SNP's main opponents, Labour and the Tories, are in no fit state to campaign on anything.

ECONOMIST: Scottish politics