The effect of badges on an eCommerce Website

An interesting research article has been recently published that explores the effect of badges on an eCommerce website. The study collected usage data from 3,234 users over a year and a half and found results which indicated that the use of badges in this setting didn't significantly increase engagement. 

Citation: Hamari, J. (2013). Transforming Homo Economicus into Homo Ludens: A Field Experiment on Gamification in a Utilitarian Peer-To-Peer Trading ServiceElectronic Commerce Research and Applications, 12 (4), 236-245