The concept of sustainability is composed of three pillars: economic, environmental, and social—also known informally as profits, planet, and people. These are in particular relevant to corporate sustainability, and efforts made by companies. Environmental sustainability is the most frequently discussed element. It is concerned with the reduction of carbon footprints, water usage, non-decomposable packaging, and wasteful processes as part of a supply chain. These processes can often be cost-effective, and financially useful as well as important for environmental sustainability. Social sustainability is about treating employees fairly and ensuring responsible, ethical, and sustainable treatment of employees, stakeholders, and the community in which a business operates. This may be achieved through more responsive benefits, like better maternity and paternity benefits, flexible scheduling, and learning and development opportunities. For example, business should operate using sustainable labour, which involves fairly-paid, adult employees who can operate in a safe environment. Economic sustainability is probably the simplest form of sustainability. To be economically sustainable, a business must be profitable and produce enough revenues to be continued into the future. The challenge with this form of sustainability is achieving an equilibrium. Rather than making money at any cost, companies should attempt to generate profit in accordance with other elements of sustainability. Focussing on social and environmental sustainability in addition to economic performance is an approach frequently referred to as the Triple Bottom Line.