Inequality has increased in recent years in both developed and developing countries. Tax experts, like others, have focused on how taxes may reduce the inequality of income and wealth. In developed countries, the income tax, especially the personal income tax, has long been viewed as the primary...

The dual income tax combines a progressive tax on labor income and a lower flat rate tax on income from capital. Denmark, Finland, Norway, and Sweden adopted dual income taxes to address a set of tax challenges that arose in the late 1980s and early 1990s. Although developing countries face much...