Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
With economic tools, people change their behaviour because the want to achieve maximal benefit at minimal cost. Economic tools involve the use of prices and other market-based instruments to provide monetary incentives to change behaviour.