The secret to Uber's success was always supposed to be scale. The company subsidized rides and drivers, operating at a loss on each ride, as it grew into what is now a global behemoth. At that point, with a huge chunk of the market secured, the profits would naturally follow.

Uber is now as dominant in its sector as any company could hope for. It has scale to rival the world's biggest companies and ... its posting losses. Big losses. What happened here? And what does it say about the future of the app?

GUEST: Alison Griswold, London-based journalist, author of Oversharing

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