How should we price services? By the hour? By results? Or by the difficulty of the task? And what impact does each model have on how businesses are run? In the first of a new series Evan Davis and guests look at the history of how we've priced our time and expertise and why this may be about to change.

Guests :
Christopher Saul, senior partner, Slaughter & May
Debbie Klein, UK CEO, The Engine Group
Russell Quirk, Founder, EMoov.