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Describe and contrast the hierarchy of needs, ERG theory, and two-factor theory.

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Hierarchy of needs is a theory in psychology proposed by Abraham Maslow. In his theory, there are 5 levels in the hierarchy of needs of humans, with the first four lower layers are called deficiency needs while the top layer is called aesthetic needs. The 5 layers in the hierarchy, arranged from lowest to highest, are as follows:
- Physiological needs, which pertains to the needs of humans in order to survive.
- Safety needs, which pertains to the desire of humans to keep themselves ...

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