 First, happiness could be a major component of a theory of well-being. Objective list theories of well-being sometimes include happiness or related mental states such as enjoyment among the fundamental constituents of well-being. A more ambitious proposal, originated by L.W. Sumner, identifies well-being with authentic happiness—happiness that is authentic in the sense of being both informed and autonomous (Sumner 1996). The root idea is that well-being involves being happy, where one’s happiness is a response of one’s own (autonomous), to a life that genuinely is one’s own (informed). The authenticity constraint is meant to address both experience machine-type worries and “happy slave” objections relating to adaptation, where happiness may be non-autonomous, depending on manipulation or the uncritical acceptance of oppressive values. Since these have been the most influential objections to mental state accounts of well-being, Sumner’s approach promises to considerably strengthen the position of happiness-centered approaches to well-being, and several philosophers have developed variants or close relations of the authentic happiness theory (Brülde 2007, Haybron 2008a, Tiberius and Plakias 2010, Višak 2015). The approach remains fairly new, however, so its long-term prospects remain  unclear.[28]