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Economic inequality
Economic inequality is an umbrella term for three concepts: income inequality, how the total sum of money paid to people is distributed among them; wealth inequality, how the total sum of wealth owned by people is distributed among the owners; and consumption inequality, how the total sum of money spent by people is distributed among the spenders. Each of these can be measured between two or more nations, within a single nation, or between and within sub-populations (such as within a low-income group, within a high-income group and between them, within an age group and between inter-generational groups, within a gender group and between them etc, either from one or from multiple nations).
Income inequality metrics are used for measuring income inequality, the Gini coefficient being a widely used one. Another type of measurement is the Inequality-adjusted Human Development Index, which is a statistic composite index that takes inequality into account. Important concepts of equality include equity, equality of outcome, and equality of opportunity.
Historically, there has been a long-run trend towards greater economic inequality over time. The exceptions to this during the modern era are the declines in economic inequality during the two World Wars and amid the creation of modern welfare states after World War II. Whereas globalization has reduced the inequality between nations, it has increased the inequality within most nations. Income inequality between nations peaked in the 1970s, when world income was distributed bimodally into "rich" and "poor" countries. Since then, income levels across countries have been converging, with most people now living in middle-income countries. However, inequality within most nations has risen significantly in the last 30 years, particularly among advanced countries.
Research has generally linked economic inequality to political and social instability, including revolution, democratic breakdown and civil conflict. Research suggests that greater inequality hinders economic growth and macroeconomic stability, and that inequality of land and human capital reduce growth more than inequality of income. Inequality is at the center stage of economic policy debate across the globe, as government tax and spending policies have significant effects on income distribution. In advanced economies, taxes and transfers decrease income inequality by one-third, with most of this being achieved via public social spending (such as pensions and family benefits). While the "optimum" amount of economic inequality is widely debated, there is a near-universal belief that complete economic equality (Gini of zero) would be undesirable and unachievable.
The Gini coefficient (also known as the Gini index or Gini ratio), is a measure of statistical dispersion intended to represent the income inequality, wealth inequality, or consumption inequality within a nation or a social group. It measures the inequality among the values of a frequency distribution, such as levels of income. A Gini coefficient of 0 reflects perfect equality, where all income or wealth values are the same, while a Gini coefficient of 1 (or 100%) reflects maximal inequality among values, a situation where a single individual has all the income or wealth while all others have none.
Oxfam's 2021 report on global inequality said that the COVID-19 pandemic has increased economic inequality substantially; the wealthiest people across the globe were impacted the least by the pandemic and their fortunes recovered quickest, with billionaires seeing their wealth increase by $3.9 trillion, while at the same time the number of people living on less than $5.50 a day likely increased by 500 million. According to economist Joseph Stiglitz, the pandemic's "most significant outcome" will be rising economic inequality in the United States and between the developed and developing world. The 2024 Oxfam report found a significant increase in inequality as roughly five billion people have become poorer while at the same time the fortunes of the five richest individuals have doubled. The report warned that current trends are paving the way for the world's first trillionaire within a decade and global poverty eradication being postponed for 229 years. Oxfam's 2025 report shows that over the last year billionaire wealth increased from $13 trillion to $15 trillion primarily through inheritance, monopoly and powerful connections, and predicts there will be at least five trillionaires in the next decade, while at the same time the number of people living in poverty has barely changed since 1990, with 44% of the global population living on less than $6.85 per day.
In 2016, the world's billionaires increased their combined global wealth to a record $6 trillion. In 2017, they increased their collective wealth to $8.9 trillion.
The existing data and estimates suggest a large increase in international (and more generally inter-macroregional) components between 1820 and 1960. It might have slightly decreased since that time at the expense of increasing inequality within countries. The United Nations Development Programme in 2014 asserted that greater investments in social security, jobs, and laws that protect vulnerable populations are necessary to prevent widening income inequality.
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Economic inequality
Economic inequality is an umbrella term for three concepts: income inequality, how the total sum of money paid to people is distributed among them; wealth inequality, how the total sum of wealth owned by people is distributed among the owners; and consumption inequality, how the total sum of money spent by people is distributed among the spenders. Each of these can be measured between two or more nations, within a single nation, or between and within sub-populations (such as within a low-income group, within a high-income group and between them, within an age group and between inter-generational groups, within a gender group and between them etc, either from one or from multiple nations).
Income inequality metrics are used for measuring income inequality, the Gini coefficient being a widely used one. Another type of measurement is the Inequality-adjusted Human Development Index, which is a statistic composite index that takes inequality into account. Important concepts of equality include equity, equality of outcome, and equality of opportunity.
Historically, there has been a long-run trend towards greater economic inequality over time. The exceptions to this during the modern era are the declines in economic inequality during the two World Wars and amid the creation of modern welfare states after World War II. Whereas globalization has reduced the inequality between nations, it has increased the inequality within most nations. Income inequality between nations peaked in the 1970s, when world income was distributed bimodally into "rich" and "poor" countries. Since then, income levels across countries have been converging, with most people now living in middle-income countries. However, inequality within most nations has risen significantly in the last 30 years, particularly among advanced countries.
Research has generally linked economic inequality to political and social instability, including revolution, democratic breakdown and civil conflict. Research suggests that greater inequality hinders economic growth and macroeconomic stability, and that inequality of land and human capital reduce growth more than inequality of income. Inequality is at the center stage of economic policy debate across the globe, as government tax and spending policies have significant effects on income distribution. In advanced economies, taxes and transfers decrease income inequality by one-third, with most of this being achieved via public social spending (such as pensions and family benefits). While the "optimum" amount of economic inequality is widely debated, there is a near-universal belief that complete economic equality (Gini of zero) would be undesirable and unachievable.
The Gini coefficient (also known as the Gini index or Gini ratio), is a measure of statistical dispersion intended to represent the income inequality, wealth inequality, or consumption inequality within a nation or a social group. It measures the inequality among the values of a frequency distribution, such as levels of income. A Gini coefficient of 0 reflects perfect equality, where all income or wealth values are the same, while a Gini coefficient of 1 (or 100%) reflects maximal inequality among values, a situation where a single individual has all the income or wealth while all others have none.
Oxfam's 2021 report on global inequality said that the COVID-19 pandemic has increased economic inequality substantially; the wealthiest people across the globe were impacted the least by the pandemic and their fortunes recovered quickest, with billionaires seeing their wealth increase by $3.9 trillion, while at the same time the number of people living on less than $5.50 a day likely increased by 500 million. According to economist Joseph Stiglitz, the pandemic's "most significant outcome" will be rising economic inequality in the United States and between the developed and developing world. The 2024 Oxfam report found a significant increase in inequality as roughly five billion people have become poorer while at the same time the fortunes of the five richest individuals have doubled. The report warned that current trends are paving the way for the world's first trillionaire within a decade and global poverty eradication being postponed for 229 years. Oxfam's 2025 report shows that over the last year billionaire wealth increased from $13 trillion to $15 trillion primarily through inheritance, monopoly and powerful connections, and predicts there will be at least five trillionaires in the next decade, while at the same time the number of people living in poverty has barely changed since 1990, with 44% of the global population living on less than $6.85 per day.
In 2016, the world's billionaires increased their combined global wealth to a record $6 trillion. In 2017, they increased their collective wealth to $8.9 trillion.
The existing data and estimates suggest a large increase in international (and more generally inter-macroregional) components between 1820 and 1960. It might have slightly decreased since that time at the expense of increasing inequality within countries. The United Nations Development Programme in 2014 asserted that greater investments in social security, jobs, and laws that protect vulnerable populations are necessary to prevent widening income inequality.