Ideally, no manufacturer should use an excess of raw materials in the production of a good if the same good could be made with fewer raw materials and thus at a lower cost. Vet instances abound of products which are designed in a manner where replacement is intrinsic to the product - for example disposable razors or cigarette lighters. The sustainable use of resources must be considered during all the stages of a product’s life-cycle: in its design, its manufacture, its usage and even at the end of its life, where the possibility of reusing or recovering scarce materials used in its production becomes a distinct and often profitable issue. Resource efficiency is only possible if consumers - individuals and institutional buyers alike - demand sustainable products.