Optimism may improve social functioning. One study found that people with high self-esteem and an optimistic view of the future were better able to cope with loneliness. People with high self-evaluations see themselves - and are seen - as more popular. There may be intellectual benefits to self-enhancement. Memory tends to be organized egocentrically so that people recall information relating to themselves well. Positive illusions may contribute positive mood. Positive affect is, in fact, an effective cue for memory retrieval. It seems to facilitate the use of efficient, rapid problem-solving strategies and enhances associations. Positive conceptions of the are associated with working harder and longer on tasks. Perseverance, in turn produces more effective performance and a greater likelihood of goal attainment. People with high esteem evaluate their performance more positively than do low-esteem people, even when the performances are equivalent. These perceptions then feed back into enhanced motivation. People with high self-esteem have higher estimations of their ability for future performance and higher predictions of future performance, regardless of prior performance. People with a stronger sense of personal efficacy are more highly motivated and therefore make more efforts to succeed. A desire for control leads people to respond more vigorously to a challenging task and to persist longer. People who expect to succeed world longer and harder than those with low expectations of success. Overall, research evidence indicates that self-enhancement, exaggerated beliefs in control and unrealistic optimism are associated with higher motivation, greater persistence, more effective performance and, ultimately, greater success.