File:World population living in extreme poverty - Our World in Data - 2015.png

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English: People are considered to live in extreme poverty at a consumption (or income) level below 1.90 international-$ per day. International $ are adjusted for price differences between countries and for price changes over time (inflation).

The absolute number of the world population is taken from the OurWorldInData world population data set: World Population Growth - Our World In Data

All poverty estimates 1981 and later are taken from the World Bank's Povcal Net (downloaded May 23, 2016)

All data from 1970 and earlier is taken from Bourguignon and Morrisson (2002) – Inequality Among World Citizens: 1820–1992. In American Economic Review, 92, 4, 727–748. Bourguignon and Morrisson (2002) state that 'the poverty lines were calibrated so that poverty and extreme poverty headcounts in 1992 coincided roughly with estimates from other sources'. To have one continuous series from 1820 up to 2015 I have followed the idea of Bourguignon and Morrisson (2002) to calibrate so that poverty headcounts in "coincide roughly" with estimates from the World Bank. Therefore the series is poverty headcount (1.90$ per day) as far back as possible (1981) from the World Bank and all observations before 1980 are Bourguignon and Morrison (2002) 'share of the world population living in extreme poverty'.
Português: Considera-se pessoas que vivem em condições de extrema pobreza aquelas com nível de consumo (ou renda) abaixo de 1,90 dólares internacionais por dia. Dólares internacionais são ajustados pelas diferenças de preços entre países e as flutuações ao decorrer do tempo (inflação).

Os números absolutos da população mundial foram tirados do banco de dados da Our World in Data: World Population Growth - Our World In Data.

Todas as estimativas de pobreza de 1981 e posteriores foram tirados de World Bank's Povcal Net (descarregados em 23 de maio de 2016)

Todos os dados de 1970 e anteriores foram tirados de Bourguignon e Morrisson (2002) – Inequality Among World Citizens: 1820–1992. In American Economic Review, 92, 4, 727–748. Bourguignon e Morrisson (2002) afirmam que "as linhas de pobreza foram calibradas de modo que a pobreza e extrema pobreza per capita coincidam aproximadamente com as estimativas de outras fontes" Para que a série de 1820 até 2015 fosse continua eu segui a ideia de Bourguignon e Morrisson (2002) de calibrar os dados, de modo que a pobreza per capita "coincidam aproximadamente" com as do Banco Mundial.
Date
Source From the Our World in Data's publication A history of global living conditions in 5 charts, by Max Roser.
Author Max Roser and Our World In Data team.

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