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What is a weighted-average days overdue and why is it useful?

Beginner

Answer

Weighted-average days overdue weights each overdue balance by its size, giving a single figure that reflects how late money is on a dollar-weighted basis. It's more meaningful than a simple average because a large, slightly-late balance matters more than a tiny, very-late one.
Real-world example A weighted-average of 18 days overdue signals the bulk of late money is only moderately late, guiding a measured response.

Common follow-ups: Why weight by balance size? | How does it differ from a simple average?