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One of the main reasons economists give for the increase in income inequality is globalization. Globalization has led to the expansion of trade, capital flows, and the movement of labor across borders. As a result, some countries and people have benefited more from globalization than others, leading to an unequal distribution of wealth and income.

Technological advancements have also contributed to the increase in income inequality. The continuous development of technology has changed the labor market. As a result, skilled laborers who can use and adapt to new technologies have seen an increase in their incomes, while unskilled workers have found it more difficult to keep up with the changing demands of the market and have seen their incomes stagnate or even decline.

Changes in institutional structures within countries have also contributed to income inequality. This includes changes in labor market policies, such as deregulation and the decline of labor unions, which have led to a weaker bargaining power for workers. Additionally, changes in corporate governance, such as the increasing role of shareholders and the growth of executive compensation, have contributed to rising inequality as well.

Educational disparities play a significant role in explaining income inequality, as access to quality education and skills training is an important determinant of an individual's income potential. In many countries, there is a significant gap in the quality of education available to low-income and high-income households, which can lead to a growing divide in income distribution as well-taught individuals secure high-paying jobs while under-educated individuals are unable to compete for those positions.

Changes in tax policy and social safety nets can also impact income inequality. Lower tax rates on high-income earners and reduced welfare benefits for low-income individuals can lead to widening income disparities. In some instances, regressive tax structures, where lower-income individuals pay a higher percentage of their income in taxes compared to wealthier counterparts, can exacerbate income inequality. In summary, the main reasons economists give for the increase in income inequality include globalization, technological advancements, institutional changes, educational disparities, and tax and social policies. Understanding these factors can help policymakers address and mitigate the negative consequences of growing income inequality in society.