Paul Graham (2015) argues every funded startup should know the answer to one question: "At your current growth rate, will you reach profitability before the money runs out?"
If yes, you're default alive — you don't need to raise more, you just need to keep going.
If no, you're default dead — without intervention (raise, cut burn, accelerate growth), you'll fail. Most founders underestimate how much intervention they need.
The simulator answers this with one threshold: does the MRR line cross the costs line before the bank balance line crosses zero?