After Positive Cash Flow: Should You Raise Again to Expand?
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Collected in Robin Shen’s Field Notes · Content type and attribution are shown above
English translation of the Chinese post originally published 2021-08-13. Translated 2026-10-23 with AI assistance. Historical figures and claims have not been updated or independently verified. 中文原文
Reading guide
The cash pressure of unit economics: customer acquisition cost (CAC) is paid up front, while customer lifetime value (LTV) takes years to realize. After finally reaching positive cash flow and profitability, founders face another decision: raise more money and increase spending again. Both founders and investors struggle with this choice; it takes foresight, patience, and resources. Caution: the original’s description of the CAC–LTV relationship raises questions about both direction and definitions. It is retained as written, has not been independently verified, and must not be used as a quantitative model. Reinvestment is not mandatory; it depends on resources and whether the expected returns can be validated.
Key points
- CAC is paid up front, LTV realized later: the cash-flow timing gap.
- The difficult choice of expanding again after reaching positive cash flow.
- Foresight, patience, and resources are needed.
- The original formula is questionable; do not use it as a model.

Full text — English translation
These articles are personal notes, book excerpts, and collected reprints. Figures and events reflect the time of the original publication, are not current information, and do not constitute investment advice.
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