Risk, Uncertainty and Profit

Knight's distinction is clean and consequential: risk is measurable probability; uncertainty is not. Insurance handles risk; entrepreneurship handles uncertainty. Profit exists precisely because some situations cannot be reduced to actuarial tables — someone must act on judgement alone. This is the theoretical foundation for everything Taleb later popularised and for every honest conversation about why product bets cannot be treated as engineering estimates. Most planning frameworks implicitly assume risk when the real situation is uncertainty, and the confusion explains a great deal of organisational dysfunction. The book is dense and academic, but the core argument in the early chapters is essential reading for anyone who allocates resources under conditions they cannot fully specify.