Thirty years ago, 1 in 7 of the world’s extreme poor – those living on less than $1.90 a day – were in Sub-Saharan Africa. Over the years, as other regions successfully reduced their poverty levels, this number has increased and by 2015, 4 in 7 of the global poor were living in Sub-Saharan Africa. The newly published Poverty and Shared Prosperity Report warns that as many as 9 in 10 of the world’s poor may live in this region by 2030 if current trends continue.
Robert Allen’s recent AER paper on “Absolute Poverty: When Necessity Displaces Desire” is a fascinating read, on many levels. The paper uses linear programming (LP) to compute (four variants of) least-cost diets for twenty countries, using prices from the International Comparisons Project (ICP) microdata. To the resulting least-cost food budgets, estimates of non-food costs covering housing, fuel, lighting, clothing and soap are added, generating “basic need poverty lines” (BNPL) for each country.