Bottom / base of the (economic) Pyramid, refers to people around the globe with an income of less than 1,500 USD per annum and capita.
Bottom of the Pyramid
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.