How to map wealth in Africa using nothing but mobile-phone minutes - Quartz
▻http://qz.com/128987/how-to-map-wealth-in-africa-using-nothing-but-mobile-phone-minutes
▻http://qzprod.files.wordpress.com/2013/09/screen-shot-2013-09-26-at-6-10-39-pm.png?w=632&h=835
A group of Belgian researchers has come up with a novel way (pdf) of mapping the distribution of wealth in #Côte_d’Ivoire—by looking at purchases of #mobile airtime minutes.