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Which common shortcuts lead to dangerous miscalculations of payback velocity?
| Shortcut | Why it fails | Corrective protocol |
|---|---|---|
| Blended revenue payback | Direct delivery and support costs are ignored, understating payback time | Calculate payback exclusively against net variable contribution margin |
| Zero-churn assumption | Defected accounts leave unamortized CAC balances that slow cohort recovery | Factor actual monthly cohort survival probabilities into the recovery schedule |
| Upfront billing treated as zero payback | Annual prepayment covers year 1 cash but does not mean CAC was zero | Distinguish working capital cash collections from economic break-even |
| Excluding sales management overhead | Front-line salaries are counted while sales engineering and enablement are dropped | Use fully loaded acquisition costs in the initial investment balance |
| Masking contraction with price hikes | Topline retention looks stable while active account usage deteriorates | Track gross margin contribution at constant price boundaries |
| Blending acquisition channels | Organic referrals with 3-month payback hide paid search campaigns with 24-month deficits | Segment payback calendars strictly by acquisition channel and customer tier |
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Reference & Evidence
Source: Table from this essay. Sources and interpretation are given in the article.
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