How do you decide whether reranking is worth the latency?

Instruction: Explain how you would decide if a reranker is paying for itself.

Context: Checks whether the candidate can explain the core concept clearly and connect it to real production decisions. Explain how you would decide if a reranker is paying for itself.

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I would test reranking on the queries that actually hurt trust, not on the easy cases. If it only helps...

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