A US government lawyer recently caused a stir in the publishing world when he said during a high profile legal trial that half of all new trade titles – books aimed at a general audience - sell a dozen copies or less. Tim Harford investigates with the help of Kristen McLean from the NPD Books group.

Presenter: Tim Harford
Producers: Octavia Woodward, Jon Bithrey
Editor: Emma Rippon
Production Coordinator: Jacqui Johnson
Sound Engineer: Graham Puddifoot



(Image: Stack of books on display at the bookstore: bitterfly/Getty)