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Are Apple and Samsung running out of people to sell their smartphones to? And who wants to pay for an upgrade when their old phone is good enough?

Manuela Saragosa asks whether Apple's recent disappointing earnings are less to do with China's slowing economy - as the company claims - and more the fact that the market for iPhones has become saturated. With few major tech improvements on the horizon, is the smartphone about to become just another mass-produced, low-margin product?

The programme features interviews with phone industry analyst Ben Wood of CCS Insight, management professor Yves Doz of Insead in Paris, and Barry C Lynn of the Open Markets Institute thank tank in Washington DC.

(Picture: Group of people using smartphones outdoors; Credit: ViewApart/Getty Images)