physiological need (most basic physical need): need for food, clothing, shelter, comfort, self-preservation
safety need: need for physical safety, emotional security, avoidance of violence
love need: need for love, friendship, affection
esteem need: need for self-respect, status, reputation, recognition, self-confidence
self-actualization need (the highest level need): need for self-fulfillment, increasing competence, suing abilities to the fullest
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