Need
A need was a thing that was required for someone to live or something to function.  

On Triskelion, the Providers were called that for they took care of all the needs of the thralls. ()

Spock assumed that on Talos IV, the Talosians manufactured their food and other needs in the deep underground. ()

In 2266, the  needed six lithium crystals from the Rigel XII miners. ()

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Economics
Psychology