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A comment on Twice as happy customers means half the marketing spend. Parent comment

Re:Twice as happy customers means half the marketing spend by Sean1708 on Friday June 23, 2017 @09:25AM (#14618972)
If M is the number of months then (since you can't have a fraction of a subscriber) you will be in steady state when

Y * X^(M - 1) < 1

so once

M > 1 - (ln Y / ln X)

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