South Africa's President Jacob Zuma gestures during the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
South Africa's President Jacob Zuma gestures during the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Nigeria's President Goodluck Ebele Jonathan (L) and South Africa's President Jacob Zuma attend the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.S)
Nigeria's President Goodluck Ebele Jonathan (L) and South Africa's President Jacob Zuma attend the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.S)
South Africa's President Jacob Zuma chats with CNBC Africa presenter Bronwyn Nielsen (R) at the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
South Africa's President Jacob Zuma chats with CNBC Africa presenter Bronwyn Nielsen (R) at the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
George Soros, Chairman of Soros Fund Management attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
George Soros, Chairman of Soros Fund Management attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
A participant is reflected in a mirror during the annual meeting of the World Economic Forum (WEF) in Davos. Picture: Reuters
A participant is reflected in a mirror during the annual meeting of the World Economic Forum (WEF) in Davos. Picture: Reuters
Nigeria's Oil Minister Diezani Alison-Madueke attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Nigeria's Oil Minister Diezani Alison-Madueke attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Muhtar Kent, CEO and chairman of the Board of the Coca Cola Company, speaks to media during the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Muhtar Kent, CEO and chairman of the Board of the Coca Cola Company, speaks to media during the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Russia's richest man Alisher Usmanov attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Russia's richest man Alisher Usmanov attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Russian businessman Viktor Vekselberg, chairman of Renova Group Switzerland, attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Russian businessman Viktor Vekselberg, chairman of Renova Group Switzerland, attends the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Russia's Prime Minister Dmitry Medvedev addresses the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.
Russia's Prime Minister Dmitry Medvedev addresses the annual meeting of the World Economic Forum (WEF) in Davos January 23, 2013.

Business leaders in Davos have plenty to worry about, from the euro zone to global geopolitical upheavals, but at heart their problem is simple: how to find new revenue in a low-growth world.

The annual World Economic Forum held from January 23 to 27, 2013 in Davos. - Reuters