── ── Strategy
Margin of Safety
Margin of Safety is the practice of committing only when there is a substantial buffer between your estimate of value and the price you pay or the bet you make. Because every estimate carries error, the buffer absorbs being wrong. It protects you from the inevitable gap between your forecast and reality.
How it works
First, make your best honest estimate of worth, cost, or required runway. Then deliberately discount it — assume you are somewhat wrong about timing, demand, or burn. You commit only if the decision still works under that pessimistic version.
The size of the margin should scale with your uncertainty and the cost of being wrong. High-confidence, reversible decisions need little buffer; irreversible bets on shaky estimates need a large one.
When to use it
- Setting a fundraising target or runway plan against an uncertain burn rate
- Pricing an acquisition, deal, or large vendor commitment
- Forecasting how long cash must last before the next milestone
- Making capital allocation decisions where downside is hard to reverse
When not to use it
Not for small, cheap, easily reversible decisions where excessive buffering just becomes paralysis and slowness.
Worked example
Engineering the bridges that carry trucks rated for cars
Civil engineers routinely design bridges to withstand loads several times greater than the maximum traffic they will ever carry. The extra capacity isn't waste — it covers unknown material flaws, corrosion, and unforeseen stresses. Benjamin Graham imported exactly this logic into investing: buy with enough buffer that even a flawed valuation still leaves you protected.
Why it matters for founders
The single most common way startups die is running out of cash one milestone short — a planning error of assuming the best-case burn and timeline. A margin of safety on runway is the difference between a tough quarter and a shutdown. deciqAI's agents stress-test plans against the pessimistic case before acting, so the buffer is built in rather than discovered too late.
Install this skill (free, MIT)
npx skills add deciqAI/knowledge-skillsFAQ
Doesn't a big margin of safety mean missing opportunities?
Sometimes, yes — you'll pass on deals that would have worked out. The trade is deliberate: you accept missing some upside in exchange for surviving the cases where you were wrong.
How big should the margin be?
Proportional to your uncertainty and the irreversibility of the decision. The less you trust your estimate and the harder it is to undo, the wider the buffer should be.