The next man, woman, person, etc.
Definition 1 of 2

Random Individual
Implies an average person without unique or specific characteristics in a given context.

She can cook as well as the next person, meaning she has average cooking skills.
Hypothetical Comparison
Used to compare oneself or somebody to an unspecified group in a general statement.

I enjoy a good book as much as the next man.
Not Literal
The phrase doesn’t refer to a specific person but is a figurative way to speak about people in general.

He's just as ambitious as the next person.
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