大象传媒

Economists in the 1920s argued in favour of Prohibition, the short-lived attempt to ban sales of alcohol in the United States. They were worried about drunkenness affecting productivity. But economics didn鈥檛 yet have the idea of the 鈥渞ational criminal鈥�, which helps to explain why Prohibition was so widely flouted. Now debates are raging about whether cannabis should continue to be prohibited. Tim Harford reveals how a branch of economics called public choice theory has a surprising explanation for why alliances in favour of banning things can command such wide support.

Producer: Ben Crighton
Editor: Richard Vadon