Use the following data to answer the question. 
Diminishing returns begin to occur with the hiring of the _________ unit of labor.
Definitions:
Everyday Experiences
Routine or common events that individuals encounter in their daily lives.
Memory Strategy
A method or technique used to enhance or improve one's ability to remember information.
Kpelle
An ethnic group primarily residing in Liberia and Guinea, or referring to their language.
Müller-Lyer Illusion
A visual illusion in which two lines of the same length appear to be of different lengths because of the orientation of arrow-like tails at their ends.
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