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Decreasing returns to scale production functions must be concave.
Facial Actions
The movements of facial muscles that express emotions and communicate nonverbally.
Social Connections
The relationships and networks among individuals that provide support, friendship, and interaction in their personal and professional lives.
Mirror Neuron Systems
Mirror neuron systems are networks of neurons in the brain that are activated both when an individual performs an action and when they observe the same action performed by another, playing a role in learning, empathy, and understanding intentions.
Proximal Caregiving
A caregiving approach that emphasizes close physical and emotional contact between the caregiver and the child.
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