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Poverty threshold

Minimum income deemed adequate to live in a specific country or place

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After 200 years of progress, the fight against global poverty is just beginning Over the past two centuries, the world has made good progress against extreme poverty. But only very recently has povert
Joe Hasell, Bertha Rohenkohl, Pablo Arriagada, Esteban Ortiz-Ospina, and Max Roser · CC BY 4.0

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In June 2025, the World Bank updated the International Poverty Line (IPL) to $3.00 per person per day in low-income countries (in PPP). It also updated the poverty line for lower-middle income countries to $4.20 per day in PPP, and for upper-middle income countries to $8.30 per day in PPP. Based on the $3.00/person/day standard, the percentage of the global population living in poverty fell from 47.1% in 1981 to 10.3% by 2024, according to World Bank estimates; this equates to 839 million people living in poverty in 2024.

History

Charles Booth, a pioneering investigator of poverty in London at the turn of the 20th century, popularised the idea of a poverty line, a concept originally conceived by the London School Board. Booth set the line at 10 (50p) to 20 shillings (£1) per week, which he considered to be the minimum amount necessary for a family of four or five people to subsist on. Seebohm Rowntree (1871–1954), a British sociological researcher, social reformer and industrialist, surveyed rich families in York, and drew a poverty line in terms of a minimum weekly sum of money "necessary to enable families … to secure the necessaries of a healthy life", which included fuel and light, rent, food, clothing, and household and personal items. Based on data from leading nutritionists of the period, he calculated the cheapest price for the minimum calorific intake and nutritional balance necessary, before people get ill or lose weight. He considered this amount to set his poverty line and concluded that 27.84% of the total population of York lived below this poverty line. This result corresponded with that from Booth's study of poverty in London and so challenged the view, commonly held at the time, that abject poverty was a problem particular to London and was not widespread in the rest of Britain. Rowntree distinguished between primary poverty, those lacking in income and secondary poverty, those who had enough income, but spent it elsewhere (1901:295–96).

The poverty threshold was first developed by Mollie Orshansky between 1963 and 1964. She attributed the poverty threshold as a measure of income inadequacy by taking the cost of food plan per family of three or four and multiplying it by a factor of three. In 1969 the inter agency poverty level review committee adjusted the threshold for only price changes.

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