In 1952, William Vickrey devised an innovative system of turnstiles for the New York subway - but it never became a reality. So how did it help make the modern world? Show more
Discover 11,128,835 listings and 279,845 playable programmes from the BBC
In 1952, William Vickrey devised an innovative system of turnstiles for the New York subway - but it never became a reality. So how did it help make the modern world? Show more