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For a few years starting 1990, the World Bank anchored absolute poverty line as $1 per day. This was revised in 1993, and through 2005, absolute poverty was $ a day for all countries on a purchasing power parity basis, after adjusting for inflation to the 1993 . dollar. In 2005, after extensive studies of cost of living across the world, The World Bank raised the measure for global poverty line to reflect the observed higher cost of living.  In 2015, the World Bank defines extreme poverty as living on less than US$ ( PPP ) per day, and moderate poverty [ citation needed ] as less than $2 or $5 a day (but note that a person or family with access to subsistence resources, ., subsistence farmers , may have a low cash income without a correspondingly low standard of living – they are not living "on" their cash income but using it as a top up). It estimated that "in 2001, billion people had consumption levels below $1 a day and billion lived on less than $2 a day."  A 'dollar a day', in nations that do not use the . dollar as currency, does not translate to living a day on the equivalent amount of local currency as determined by the exchange rate .  Rather, it is determined by the purchasing power parity rate, which would look at how much local currency is needed to buy the same things that a dollar could buy in the United States.  Usually, this would translate to less local currency than the exchange rate in poorer countries as the United States is a relatively more expensive country. 
4. Individual – individual lack of efforts also contribute towards generating poverty. Some people are unwilling to work hard or even not willing to work altogether, leaving their families in the darkness of poverty. Personal demons like drinking and gambling also leads to draining of the family income inciting poverty.
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