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

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 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

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