Progressive Taxation: A tax system where the tax rate increases as the taxable amount increases; it's one method used for wealth redistribution.
Welfare State: A type of government in which it plays a key role in protecting and promoting the economic and social well-being of its citizens, often through policies like wealth redistribution.
Income Inequality: The unequal distribution of household or individual income across various participants in an economy. It is often presented as the percentage of income related to a percentage of population.