| Method | Per month | Per year | % of revenue |
|---|---|---|---|
| By share of revenue | – | – | – |
| By goal (customers x cost per customer) | – | – | – |
| By test-phase limit | – | – | – |
| Layer | Per month (cautious budget) | Per month (ambitious budget) |
|---|---|---|
| Foundations | – | – |
| Acquisition | – | – |
| Retention | – | – |
There is no universal figure: these three methods give you a range so you can decide. The split by layers is only a starting point you can change. Review the result every quarter with real data.
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