A large scale statistical analysis of sustainability ratings for European and US companies provides further impetus to the debate on links between share price performance and sustainability measures.? Bank Sarasin tackles head on the contention that "there is no such thing as a free lunch"?, i.e. sustainable investment must harm either portfolio performance by limiting diversification or company performance by increasing costs.? The report concludes that sustainability does not impede financial performance and can, in certain cases, be shown to make a positive contribution to share performance.? ?