Extremism about Demands is the view that morality is significantly more demanding than prevailing common-sense morality acknowledges. This view is not widely held, despite the powerful advocacy on its behalf by philosophers such as Peter Singer, Shelly Kagan, Peter Unger, and G.A. Cohen. Most philosophers have remained attracted to some version of Moderation about Demands, which holds that the behavior of typical well-off people is permissible, including the ways that such people tend to employ their economic and other resources. It is difficult to resist the conclusion that proponents of Extremism have not taken sufficiently seriously the central convictions that motivate the Moderate view.This dissertation offers an improved defense of...