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El Salvador is the first nation to recognise the cryptocurrency Bitcoin as legal tender. John Dennehy is a journalist based in the country and reports on the first day of Bitcoin barter, and Joe Saluzzi at Themis Trading looks at the response on the markets. Also in the programme, there's a new round of protests in India, with farmers concerned about agricultural reforms that change how they sell their produce. We find out more from Devinder Sharma, who is an author and expert on agriculture in India. The price of aluminium has risen sharply in response to a coup in Guinea, where much of the ore bauxite is mined. Caroline Bain is chief commodities economist at Capital Economics and tells us how long the price hike is likely to last. Plus, Kai Fu Lee is a former chief executive of Google China and artificial intelligence pioneer, and discusses the opportunities and threats posed by the technology.

(Picture: A shop in El Salvador accepting Bitcoin. Picture credit: Getty Images.)