 The work of Emmanuel Saez, for example, has concerned the role of American tax policy in aggregating wealth into the richest households in recent years while Thomas Sowell and Gary Becker maintain that education, globalization, and market forces are the root causes of income and overall economic inequality.The Revenue Act of 1964 and the "Bush Tax Cuts" coincide with the rising economic inequality in the United States both by socioeconomic class and race.Economists and related experts have described America's growing income inequality as "deeply worrying", unjust, a danger to democracy/social stability, and a sign of national decline.