The study deals specifically with the economic benefits of mediation.
Best Practice Conflict (Cost) Management 2012 - The True Value of Mediation (only available in German language)
"Konfliktkostenstudie 2 der Unternehmerschaft Düsseldorf, KPMG u.a." [Conflict Cost Study 2 by Unternehmerschaft Düsseldorf, KPMG et al.]