The bottom of the pyramid, bottom of the wealth pyramid, bottom of the income pyramid or the base of the pyramid is the largest, but poorest socio-economic group. In global terms, this is the 2.7 billion people who live on less than $2.50 a day.
The wealth pyramid. As we move higher and higher up in wealth we find fewer and fewer people having that wealth and vice versa.
Approximate visualisation of the wealth pyramid when 1% population controls 50% of the wealth
Coimbatore Krishnarao Prahalad was an Indian-American entrepreneur and author.
Prahalad at World Economic Forum's India Economic Summit in 2009