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Small additions compound.
Model a simple habit: add real contacts every month, account for natural attrition, and see the database you could be writing to.
Set your assumptions
Projected list size
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Adjust the assumptions to model your database.
—net contacts added
—total list growth
—contacts reached in final month
—cumulative monthly sends
This is a planning estimate, not a guarantee. It assumes additions happen before attrition each month.