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# Know the rough numbers. Data-driven national lists...
> Know the rough numbers. Data-driven national lists may require thousands of copies sold in a single week, with higher numbers needed for a safe margin, and the threshold shifts with competition. Researching the specific list and season replaces hope with a target.
**Source:** [[livestreams/Book Launch Strategy, Ethical Marketing, and Bestseller Lists - Workbook|Book Launch Strategy, Ethical Marketing, and Bestseller Lists]]
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“Know the rough numbers. Data-driven national lists may require thousands of copies sold in a single week, with higher numbers needed for a safe margin, and the threshold shifts with competition. Researching the specific list and season replaces hope with a target.”
— Bryant McGill
https://bryantmcgill.com/quotes/quotes-know-rough-numbers-replaces-hope-target
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