The ‘Ndrangheta are one of Italy’s biggest and most dangerous criminal gangs. One piece of research suggested they have an annual turnover of €53bn - more than McDonalds and Deutsche Bank combined.But is that number realistic? Professor Anna Sergi and Professor Francesco Calderoni help us figure out what kind of number makes sense.Reporter: Perisha Kudhail
Series producer: Tom Colls
Sound mix: Neil Churchill
Editor: Richard Vadon(Picture: Human hands with strings controlling diagram.
Credit: Boris Zhitkov/Getty Images)