Evan Davis and guests discuss the bitcoin economy. What sort of things can you buy with them, how much are they worth, and why does the world need another currency?

The new economy based on bitcoins, the computer-generated crypto-currency, is the subject for discussion. What can you buy with them and as the market fluctuates wildly, can investors hold their nerve? The programme will look at how the bitcoin craze began and whether the world really does need another currency. Evan Davis's guests are from new companies hoping to cash in - one trades bitcoins, another stores them and the third enables you to spend them online.

Contributors :

Marc Warne, Bittylicious

Nicolas Cary, Blockchain

Moe Levin, Bitpay

Producer : Rosamund Jones.