My Bottom Line: Charles Cohen, Probability

Charles Cohen is chief executive of the mobile gaming company Probability, external.

He says it is vital to listen to your customers, and learn when to stop trying to flog a dead horse.

Charles appeared on The Bottom Line, external, which was broadcast on BBC Radio 4, external, the BBC World Service, external and the BBC News Channel, external. You can also download the podcast, external.

Explore more My Bottom Line, external videos.