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In this excerpt, Jason Lemkin warns founders that the most common financial mistake is building models without enough sensitivity analysis. He explains that even a small miss on growth targets can dramatically increase a startup’s burn rate because the costs of hired headcount are already incurred. Without modeling under‑performance scenarios, founders underestimate burn and risk running out of cash. Lemkin emphasizes the need for robust sensitivity scenarios that account for lower‑than‑expected growth and fixed expense commitments.










