| Code | SI.SPR.PC40 |
| Indicator Name | Survey mean consumption or income per capita, bottom 40% of population (2021 PPP $ per day) |
| Short definition | Mean consumption or income per capita (2021 PPP $ per day) of the bottom 40%, used in calculating the growth rate in the welfare aggregate of the bottom 40% of the population in the income distribution in a country. |
| Long definition | Mean consumption or income per capita (2021 PPP $ per day) of the bottom 40%, used in calculating the growth rate in the welfare aggregate of the bottom 40% of the population in the income distribution in a country. |
| Source | World Bank, Poverty and Inequality Platform. Data are based on primary household survey data obtained from government statistical agencies and World Bank country departments. Data for high-income economies are mostly from the Luxembourg Income Study database. For more information and methodology, please see http://pip.worldbank.org., World Bank (WB), uri: http://www.worldbank.org/en/topic/poverty/brief/global-database-of-shared-prosperity |
| Topic | Poverty: Shared prosperity |
| Dataset | WDI |
| Unit of measure | 2021 PPP $ |
| Periodicity | Annual |
| Reference period | 2004-2024 |
| Aggregation method | NA |
| Statistical concept and methodology | Methodology: Survey mean consumption or income per capita, bottom 40% of population measures the amount of consumption or income per person per day in the bottom 40% of the population. It is estimated from survey data and expressed in 2021 PPP dollars.
Statistical concept(s): Survey mean consumption or income per capita, bottom 40% of population measures the amount of consumption or income per person per day in the bottom 40% of the population. It is estimated from survey data and expressed in 2021 PPP dollars. |
| Development relevance | It measures improvements in the well-being of the poor, thus monitoring inequality within countries (SDG 10). Inequality undermines economic growth and development in the long run, limits the potential of growth to reduce poverty, and weakens social cohesion and trust. |
| Limitations and exceptions | Because household surveys are infrequent in most countries and are not aligned across countries, comparisons across countries or over time should be made with a high degree of caution. |
| Other notes | The choice of consumption or income for a country is made according to which welfare aggregate is used to estimate extreme poverty in the Poverty and Inequality Platform (PIP). The practice adopted by the World Bank for estimating global and regional poverty is, in principle, to use per capita consumption expenditure as the welfare measure wherever available; and to use income as the welfare measure for countries for which consumption is unavailable. However, in some cases data on consumption may be available but are outdated or not shared with the World Bank for recent survey years. In these cases, if data on income are available, income is used. Whether data are for consumption or income per capita is noted in the footnotes. Because household surveys are infrequent in most countries and are not aligned across countries, comparisons across countries or over time should be made with a high degree of caution. |
| License URL | https://datacatalog.worldbank.org/public-licenses#cc-by |
| License Type | CC BY-4.0 |
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