In 1943 Abraham Maslow established a model of five fundamental human needs that motivate human behavior. Maslow saw these needs as a hierarchy. The basic or lower needs in his hierarchy are physiological needs and needs for security and safety. Emotional needs, such as our need for belonging, for self-esteem and for achieving our full potential are higher up in Maslow's hierarchy. This means that needs which are higher up in the hierarchy will drive our behavior only after we have fulfilled our more basic needs. Over the years, this hierarchical model of needs has helped us understand what motivates human behavior.
According to Maslow's hierarchy, which needs are basic, and which needs appear higher up in his hierarchy?