Need
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Needs refer to things that people "must" have. They are often contrasted with wants, which are more discretionary.
The most widely known academic model of needs was proposed by Abraham Maslow. In it, he proposed that people have a hierarchy of needs, which range from security to self actualization. However, while this model is intuitively appealing, it has not been supported by evidence. See: Clayton Alderfer.
The academic study of needs was at its zenith in the 1950's, but receives scant attention today. One exception is Richard Sennett's work on the importance of respect.