In 1943, the US psychologist Abraham Maslow published a paper called A Theory of Human Motivation, in which he said that people had five sets of needs, which come in a particular order. The hierarchy of needs was displayed in the form of a pyramid. As each level of needs is satisfied, the desire to fulfil the next set kicks in.

An internet meme takes the theory of Maslow further:

Maslow’s Pryamid of Needs, updated to the 21st century

Read more about Maslow at BBC News


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