Should the rich bear the brunt of the tax burden, or should it be shared proportionately among the population? This issue has dominated recent public debates over the tax system, and is a controversial issue among economists. This book contains nine essays by economists on tax progressivity--how the tax burden is borne across income classes--and how the tax system affects the inequality of income. It presents the basic facts about how tax progressivity in the U.S. has changed in the 1980s, and assesses its role in exacerbating or offsetting the overall trend toward increased income inequality.