It is not realistic to expect that one single policy tool can effectively edit out an undesirable product from the market and at the same time stimulate innovation towards more sustainable options. In addition, certain policy tools may be effective in stimulating technical improvement of existing products, while other tools may be needed to encourage more radical innovations at the systems level. For example, technical standards can be important tools for improving the performance of an established kind of product or production process, but they typically don't provide any incentives for systems innovation.