The study also showed that the income of the poorest population was approaching, in relative terms, the international poverty line over the period: the distance between the income of the poorest and the poverty line was reduced from 6% to 2.3%.
The poorest quintile of the population is shown to earn 9% less in real terms than in 1977.
From the poorest quarter of the population, only 12% of students attend university - the same as last year - and well below the national average.
Research shows children of parents who are in the poorest fifth of the population tend to do worse than those of the richest fifth of the population.
But of course in many countries, women tend to be the poorest segment of the population, a status that is further solidified by the existence of patriarchal attitudes.
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Meanwhile, the poorest 20% of the population must make do with only 2.8% of the wealth, down from 4%.
The big gainers are the poorest 20% of the population.
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In fact, a UNICEF analysis illustrated that across 31 countries in sub-Saharan Africa less than a third of children in the poorest 20 percent of the population receive appropriate treatment for diarrhoea, compared to almost half of children in the wealthiest 20 percent.
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Furthermore, almost all low-income countries with available data highlight a wide disparity in antibiotic use for suspected childhood pneumonia between the poorest and richest sections of the population.
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The majority of the population in every one of Mexico's 100 poorest municipalities is of indigenous descent, says Mr Abreu.
Malawi, which has a population of about 15 million, remains one of the poorest countries in the world.
As in much of the developing world, population growth in India has become heavily concentrated in the poorest areas with large populations.
For men aged between 65 and 69, the mortality risk for the wealthiest decile of the population is 40% lower than the risk for the poorest decile.
The figure would represent around one in nine people on earth, according to current population projections, but would mainly affect the world's poorest people in Africa, Asia and Latin America, according to the authors of "Human Tide: The Real Migration Crisis, " produced buy the charity Christian Aid.
Then, the richest fifth of the population accounted for 43% of all earned income, and the poorest fifth 2.4%.
When a community is listed as one of the poorest counties in the United States and has more than 50 percent of its population living in poverty, the options for its future may seem bleak.
Today, even though Native Americans are still the poorest of the poor, a recent study shows that we have increased our population rate and our per-capita income more than any other ethnic group in the country during the past decade.
Many of the poorest are Maoris, who make up about 15% of New Zealand's population of 3.6m.
Kerimov is building a 45, 000-seat stadium to replace Anzhi's 15, 200-seat roofless bowl, but it is hard to see the new facility as an instant money-spinner: Makhachkala's population is less than 600, 000, and Dagestan is one of the poorest regions of Russia.
More than 70% of Beijing's population were online last year, compared to 24.2% of people in Guizhou, the poorest province in China.
Yemen is the poorest country in the Middle East, with a severe shortage of water and rising levels of malnutrition among its population of about 25 million.
For example, it notes that in Tanzania, child mortality in the richest fifth of the population fell from 135 to 90 per 1, 000 births over the research period, while the poorest fifth saw hardly any progress with a modest fall of 140 to 137 per 1, 000 births.
Albania, the poorest state in Europe, has taken half the refugees, including some expelled by Macedonia, and seen its own population swell by a tenth.
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