But analysts say continuing frustration over corruption and lack of progress on the economy could pose a danger to the success of Tunisia's transition to democracy.

BBC: Arab uprising: Country by country - Tunisia

But it was not enough to overcome disappointment over sales of the company's new iPhone 5, as analysts said the firm was in danger of becoming a victim of its own success.

BBC: Samsung leads mobile phone shipments

It is rich countries' fear of emerging economies' success, not that success itself, that is the real danger to the world economy.

ECONOMIST: Playing leapfrog