Maslow's hierarchy of needs
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"Maslow's hierarchy of needs is often depicted as a pyramid consisting of five levels: the four lower levels are grouped together as deficiency needs, while the top level is termed being needs. While our deficiency needs must be met, our being needs are continually shaping our behaviour. The basic concept is that the higher needs in this hierarchy only come into focus once all the needs that are lower down in the pyramid are mainly or entirely satisfied. Growth forces create upward movement in the hierarchy, whereas regressive forces push prepotent needs further down the hierarchy."