Assuming 30 trading days horizon, CAC 40 is expected to under-perform the Vilmorin. In addition to that, CAC 40 is 1.07 times more volatile than Vilmorin & Cie. It trades about -0.18 of its total potential returns per unit of risk. Vilmorin & Cie is currently generating about -0.07 per unit of volatility. If you would invest 8,100 in Vilmorin & Cie on April 24, 2012 and sell it today you would earn a total of 5.00 from holding Vilmorin & Cie or generate 0.06% return on investment over 30 days.
Diversification
Good diversification
Overlapping area represents amount of risk that can be diversified away by holding CAC 40 and Vilmorin & Cie in the same portfolio (assuming nothing else is changed)