In economics, the Gini coefficient, also known as the Gini index or Gini ratio, is a measure of statistical dispersion intended to represent the income inequality, the wealth inequality, or the consumption inequality within a nation or a social group. It was developed by Italian statistician and sociologist Corrado Gini.
Economic inequality is an umbrella term for a) income inequality or distribution of income, b) wealth inequality or distribution of wealth, and c) consumption inequality. Each of these can be measured between two or more nations, within a single nation, or between and within sub-populations.
In economics, income distribution covers how a country's total GDP is distributed amongst its population. Economic theory and economic policy have long seen income and its distribution as a central concern. Unequal distribution of income causes economic inequality which is a concern in almost all countries around the world.
Income inequality metrics or income distribution metrics are used by social scientists to measure the distribution of income and economic inequality among the participants in a particular economy, such as that of a specific country or of the world in general. While different theories may try to explain how income inequality comes about, income inequality metrics simply provide a system of measurement used to determine the dispersion of incomes. The concept of inequality is distinct from poverty and fairness.
The distribution of wealth is a comparison of the wealth of various members or groups in a society. It shows one aspect of economic inequality or economic heterogeneity.
International inequality refers to inequality between countries, as compared to global inequality, which is inequality between people across countries. International inequality research has primarily been concentrated on the rise of international income inequality, but other aspects include educational and health inequality, as well as differences in medical access. Reducing inequality within and among countries is the 10th goal of the UN Sustainable Development Goals and ensuring that no one is left behind is central to achieving them. Inequality can be measured by metrics such as the Gini coefficient.
Income inequality has fluctuated considerably in the United States since measurements began around 1915, moving in an arc between peaks in the 1920s and 2000s, with a 30-year period of relatively lower inequality between 1950 and 1980.
Income in India discusses the financial state in India. With rising economic growth and prosperity, India's income is also rising rapidly. As an overview, India's per capita net national income or NNI was around Rs. 98,374 in 2022-23. The per-capita income is a crude indicator of the prosperity of a country. In contrast, the gross national income at constant prices stood at over 128 trillion rupees. The same year, GRI growth rate at constant prices was around 6.6 percent. While GNI and NNI are both indicators for a country's economic performance and welfare, the GNI is related to the GDP or the Gross Domestic Product plus the net receipts from abroad, including wages and salaries, property income, net taxes and subsidies receivable from abroad. On the other hand, the NNI of a country is equal to its GNI net of depreciation.
Social inequality occurs when resources within a society are distributed unevenly, often as a result of inequitable allocation practices that create distinct unequal patterns based on socially defined categories of people. Differences in accessing social goods within society are influenced by factors like power, religion, kinship, prestige, race, ethnicity, gender, age, sexual orientation, intelligence and class. Social inequality usually implies the lack of equality of outcome, but may alternatively be conceptualized as a lack of equality in access to opportunity.
The inequality of wealth has substantially increased in the United States in recent decades. Wealth commonly includes the values of any homes, automobiles, personal valuables, businesses, savings, and investments, as well as any associated debts.
Redistribution of income and wealth is the transfer of income and wealth from some individuals to others through a social mechanism such as taxation, welfare, public services, land reform, monetary policies, confiscation, divorce or tort law. The term typically refers to redistribution on an economy-wide basis rather than between selected individuals.
Income inequality in the Philippines is the extent to which income, most commonly measured by household or individual, is distributed in an uneven manner in the Philippines.
China's current mainly market economy features a high degree of income inequality. According to the Asian Development Bank Institute, “before China implemented reform and opening-up policies in 1978, its income distribution pattern was characterized as egalitarian in all aspects.”
Income inequality in India refers to the unequal distribution of wealth and income among its citizens. According to the CIA World Factbook, the Gini coefficient of India, which is a measure of income distribution inequality, was 35.2 in 2011, ranking 95th out of 157. Wealth distribution is also uneven, with one report estimating that 54% of the country's wealth is controlled by millionaires, the second highest after Russia, as of November 2016. The richest 1% of Indians own 58% of wealth, while the richest 10% of Indians own 80% of the wealth. This trend has consistently increased, meaning the rich are getting richer much faster than the poor, widening the income gap. Inequality worsened since the establishment of income tax in 1922, overtaking the British Raj's record of the share of the top 1% in national income, which was 20.7% in 1939–40. According to Oxfam India's report of 2023, "Survival of the Richest: India Story," just 5 per cent of Indians own more than 60 per cent of the country's wealth, while the bottom 50 per cent of the population possess only 3 per cent of the wealth. It also says that between 2012 and 2021, 40% of wealth generated in India has gone to just 1% of the total population and 3% of the wealth has gone to bottom 50%. The number of hungry Indians increased to 350 million in 2022 from 190 million in 2018, while the number of billionaires has increased from 102 in 2020 to 166 in 2022. The covid pandemic reduced the income of the poor, but the wealthy did well. The combined wealth of India's 100 richest is now above $600 billion, which is equivalent to India's Union Budget for 18 months. According to Union Government 's own submission to Supreme Court of India, widespread hunger has caused 65% of deaths of children under the age of 5 in 2022. Saurabh Mukherjee, the founder and CIO of Marcellus Investment Managers, along with his colleague Nandita Rajhansa, has coined the term "Octopus Class" to depict 2 lakh families or around 1 million people in India who control 80% of India's wealth. This class has consolidated financial, social and political power and has continuously pushed its 'tentacles' in every profitable activity they are interested in, aided by liberalisation and consequent growth of globalised economy since 1991.
Tax policy and economic inequality in the United States discusses how tax policy affects the distribution of income and wealth in the United States. Income inequality can be measured before- and after-tax; this article focuses on the after-tax aspects. Income tax rates applied to various income levels and tax expenditures primarily drive how market results are redistributed to impact the after-tax inequality. After-tax inequality has risen in the United States markedly since 1980, following a more egalitarian period following World War II.
Poverty in New Zealand deals with the incidence of relative poverty in New Zealand and its measurement. Between 1982 and 2011, New Zealand's gross domestic product grew by 35%. Almost half of that increase went to a small group who were already the richest in the country. During this period, the average income of the top 10% of earners in New Zealand almost doubled going from $56,300 to $100,200. The average income of the poorest tenth increased by only 13% from $9700 to $11,000. Figures from 2016 show that about 15% of the population lives in poverty, compared to 9% in the 1980s, and 22% in 2004.
Poverty in Poland has been relatively stable in the past decades, affecting about 6.5% of the society. In the last decade there has been a lowering trend, as in general Polish society is becoming wealthier and the economy is enjoying one of the highest growth rates in Europe. There have been noticeable increases in poverty around the turns of the decades, offset by decreases in poverty in the years following those periods.
Wealth inequality in Latin America and the Caribbean refers to economic discrepancies among people of the region. A report release in 2013 by the UN Department of Economic and Social Affairs entitled Inequality Matters. Report of the World Social Situation, observed that: ‘Declines in the wage share have been attributed to the impact of labour-saving technological change and to a general weakening of labour market regulations and institutions. Such declines are likely to affect individuals in the middle and bottom of the income distribution disproportionately, since they rely mostly on labour income.’ In addition, the report noted that ‘highly-unequal land distribution has created social and political tensions and is a source of economic inefficiency, as small landholders frequently lack access to credit and other resources to increase productivity, while big owners may not have had enough incentive to do so.
China has been one of the fastest growing economies in the world since the implementation of its reform policies in the late 1970s. This economic growth has been accompanied by a rapid increase in income inequality that China's Gini coefficient increased from 0.310 in 1981 to 0.468 in 2018. Several policies have been introduced with the aim to alleviate the income inequality in China.
