The explanation is that an individual's happiness depends on the match between what he aspires to and what he experiences,and that his aspirations depend on his own experience and what he observes about others'experience.Aspirations are formed by adaptation,or habituation,and rivalry.▪ The explanation is that an individual’s happiness depends on the match between what he aspires to and what he experiences, and that his aspirations depend on his own experience and what he observes about others’ experience. Aspirations are formed by adaptation, or habituation, and rivalry