Why do we seem to get less and less pleasure from some things over time? And what can we do about it? Are there dimensions along which some people can't be satiated (e.g., perhaps narcissists can't get "enough" adoration)? What are the structures of needs and incentives in cults? How should we think about the pursuit of long-term happiness, which sometimes requires us to sacrifice some amount of short-term happiness? Are people more likely to make choices that verify their identities or that improve their identities?Robert Smith is an Assistant Professor of Marketing at Tilburg University in the Netherlands. He has previously taught at the University of Michigan and Ohio State University. He does research on enjoyment and the many ways that people learn about themselves. You can learn more about him here.