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"Some two-thirds of the world’s population go to sleep hungry at night.
The World Bank estimates that perhaps as much as one-fifth of the world
survives on no more than $1 per day. Outright famine regularly occurs in
various parts of the world.[...] An assessment and an analysis of
poverty problems require an explicit understanding of the very
foundations of economic activity."
From: Economics of Social Issues
by Ansel Sharp and Charles Register