Stress is best? How surprises make you stronger
2012-11-21 0:00

From: The Economist

Antifragile: Things that Gain from Disorder.

What is the opposite of fragility? Though not quite right, “resilience” and “robustness” are two words that come to mind. If fragility means something that breaks under stress, its exact opposite should mean something that grows stronger under pressure. There is no word that quite captures this, says Nassim Nicholas Taleb, an American essayist and scholar, so he has invented one: “antifragile”.

The neologism is necessary because antifragility, he argues, is the secret to success in a world full of uncertainty. Mr Taleb’s earlier books were devoted to showing that no one can measure the likelihood of rare events—or “black swans”, in his now famous phrase. From the financial crisis to the tsunami that struck the Fukushima nuclear reactor in 2011, the worst-case scenario will never be quite bad enough. So instead of trying to predict the future and failing, the best thing to do is try to benefit from shocks when they occur.

That, after all, is what nature does. Evolution is a system for turning random mutations to lasting advantage. The body responds well to certain pressures; the bones in the racquet-holding arm of professional tennis players are stronger than those in the other arm, for example.

There are all sorts of ways in which bad events contain useful information. Pain teaches children what to avoid. The failures of past entrepreneurs steer the next lot of start-ups away from the same mistakes. Plane crashes yield data that make the next flight safer. (Bank failures have the opposite effect; because of the interconnectedness of the financial system, one blow-up makes another more likely, not less.)

Indeed, Mr Taleb thinks the big mistake is trying too hard to avoid shocks. Long periods of stability allow risks to accumulate until there is a major disaster; volatility means that things do not get too far out of kilter. In the economy cutting interest rates at the first sign of weakness stores up more trouble for later. In markets getting rid of speculators means prices are more stable in general but any fluctuations cause greater panic. In political systems the stability brought by regimes such as Hosni Mubarak’s in Egypt was artificial; without any effective way for people to express dissent, change leads to collapse.

The principle applies to career choices too. An apparently secure job within a large company disguises a dependency on a single employer and the risk that unemployment will cause a very sudden and steep loss of income. Professions that have more variable earnings, like taxi-driving or prostitution, are less vulnerable to really big shocks. They also use volatility as information: if a cabbie is in a part of town where there are no fares, he heads to a different area.


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