TB: Antifragility

Beyond resilience and robustness: a property of systems that gain from disorder, volatility, and stressors rather than merely surviving them. The opposite of fragile is not robust (unchanged by shocks) but antifragile (improved by shocks). Coined by Nassim Taleb.

The fragile/robust/antifragile trichotomy is a powerful diagnostic. Most of what we try to protect (jobs, institutions, supply chains, financial systems) we make fragile by over-optimizing for stability and removing the stressors that would build genuine robustness. The antifragile prescription is: embrace optionality, accept small losses to avoid large ones, favor trial-and-error over planning, prefer excess capacity over efficiency, and love the "via negativa" (remove negatives rather than add positives). Antifragility also explains biological systems: muscles, immune systems, and minds all get stronger under appropriate doses of stress.

• Antifragile (Taleb): the central text — barbell strategy (go safe on one extreme, take small high-upside bets on the other, avoid the middle); via negativa (subtracting harmful things is more powerful than adding beneficial ones); "don't tell me what you think, show me your portfolio"
• The Black Swan (Taleb): antifragility as the solution to living under fat-tailed uncertainty — build systems that benefit from tail events rather than being destroyed by them

• Lindy Effect — Lindy things are antifragile by revealed preference: they survived shocks
• Skin in the Game — antifragile systems require personal exposure; skin in the game creates the incentives that produce antifragility
• Second-Order Thinking — the second-order consequence of removing all stressors is fragility
• Local vs Global Optima — efficiency optimization produces local optima that are globally fragile