Why Clojure idiom prefer to return nil instead of empty list like Scheme?

Question

From a comment on another question, someone is saying that Clojure idiom prefers to return nil rather than an empty list like in Scheme. Why is that?

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Answer 1

Also note that the union of collection types and nil form a monoid, with concatenation the monoid plus and nil the monoid zero. So nil keeps the empty list semantics under concatenation while also representing a false or "missing" value.

Python is another language where common monoid identities represent false values: 0, empty list, empty tuple.