Social disparities have a common and consistent character in the vast majority of contemporary countries. The level of income inequality in OECD countries has grown in the past 30 years and is still rising. Taxes and tax systems, aside from social transfers, are fiscal instruments widely used in...

Introduction: Measuring Tax Progression -- Theories: Local Measures -- Global Measures -- Uniform Measures -- Applications: Data and Fiscal Institutions of the Surveyed Countries -- Numerical Results -- Statistical Tests -- Progression Intensity