Cautionary Conversation: Andy Warhol’s assistant, Gerard Malanga, is facing a long prison sentence in Italy. He’s forged several Che Guevara portraits and tried to pass them off as genuine Warhols. What happens next is a landmark event in the history of art and authenticity…

Tim Harford is joined by Alice Sherwood, author of Authenticity, to discuss truth and fakery in modern times. Today, authenticity seems to matter more than ever — and yet we’re also constantly assailed by people and products that are not what they seem. What’s going on here? And what’s the attention economy got to do with it?