02:50More or LessHow Louis Bachelier Scooped Economists by Half a CenturyBBC World Service Duration: 9 minutes Tue 16th Jan 2018, 02:50 on BBC World Service East and Southern AfricaAvailable for over a yearListen nowA forgotten French mathematician’s unusual approach to the stock market. Show more GenresFactualFormatsMagazines & ReviewsBrandMore or Less Source: BBC Online