a class. Marx thought that capitalists can never be totally "indifferent" to use-values, because inputs of sufficient quality (labour, materials, equipment) must be bought and managed to produce outputs that: will sell at an adequate profit; are legally permitted by the state to be sold; do not destroy the reputation of the supplier (with its obvious effect on sales). For this purpose, the inputs in production must moreover be used in an economical way, and care must be taken not to waste resources to the extent that this would mean additional costs for an enterprise, or reduce productivity. The Theory of Use Values relates directly to human labour and the power of machines to destroy value, "Living labour must seize on these things, awaken them from the dead, change them from merely possible into real and effective use values". It is just that from the point of view of the financier or investor, the main concern is not what exactly is being produced as such or how useful that is for society, but whether the investment can make a profit for him. If the products of the enterprise being invested in sell and make a profit, then that is regarded as sufficient indication of usefulness. Even so, the investor is obviously interested in "the state of the market" for the enterprise's products—if certain products are being used less or used more, this affects sales and profits. So to evaluate "the state of the market", the investor needs knowledge about the place of a product in the value chain and how it is being used. Often, Marx assumed in Das Kapital for argument's sake that supply and demand will balance, and that products do sell. Even so, Marx carefully defines the production process both as a labour process creating use-values, and a valorisation process creating new value. He asserts only that "capital in general" as an abstract social power, or as a property claim to surplus value, is indifferent to particular use-values—what matters in this financial relation is only whether more value can be appropriated through the exchanges that occur. Most share-holders are not interested in whether a company actually satisfies customers, they want an adequate profit on their investment (but a countertrend is so-called "socially responsible investing"). In modern times, business leaders are often very concerned with total quality management in production, which has become the object of scientific studies,