You've taken a hostage, but what are they worth? 97.5% of all hostages who are taken for ransom are returned but pricing is as important a factor as the negotiating.

In this episode of I've Been Thinking Peter is in conversation with Professor Anja Shortland from King's College London on the economics of kidnapping and also the world of art theft where the usual rules of law and to an extent crime, don't apply.

Do visit Professor Anja Shortland's page at King's College London with links to further papers and books - www.kcl.ac.uk/people/anja-shortland-1

Keep up to date with Peter on Twitter - @peterfrankopan

Produced, edited and mixed by @producerneil