Total assets of indexed mutual funds have spectacularly grown during the past recent years. This phenomenon is discussed in two recent books: "Common Sense on Mutual Funds" by John C. Byle and "What Wall Street Doesn't Want you to Know" by Larry E. Swedroe. Both lodes share the same analysis. According to them, actively managed funds do not show better performances than indexed ones. Over the long run management fees explain differences in performance. Both authors claim that indexed funds are preferred to actively managed ones because they have lower risks and, in general, lower fees. The same article also discusses "Le Marché Financier Français" by Juliette Pilverdier and Joanne Hamet.
AFTALION, F. (2001). 1) Common Sense on Mutual Funds, 2) What Wall Street Doesn't Want you to Know. Bankers, Markets and Investors, pp. 57-58.