'Running a business is a marathon, not a sprint'

In the 1980s, Clem Chambers created some of the world's first computer games. This industry now earns $100bn a year but Clem's firm, CRL, didn't last long enough to reap the full rewards. Now, he runs a business launching crypto-currencies on the blockchain. The lesson, he says, is that business is a marathon, not a sprint.

Video journalist: Jeremy Howell

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