Please see the link below for the economic impact report of the Rugby World Cup 2015 by Ernst & Young that was published in November 2014:

http://www.ey.com/Publication/vwLUAssetsPI/The-economic-impact-of-Rugby-World-Cup-2015/$FILE/RWC%202015%20Economic%20impact%20study.pdf (40 pages)

A post tournament report will be available in March 2016.