Tyler Cowen linked to this symposium in the Guardian on Piketty’s success. Emanuel Derman’s response is awesome; here’s the latter half:
[Economists] can’t agree on the efficacy of money printing or austerity. They keep changing their minds every few years about conventional wisdom while at every instant appearing to be certain that they are right. My gripe with economists is not that their models don’t work well – they don’t, look at the role of central banks in the financial crisis – but that they seem so reluctant to acknowledge the riskiness of their advice. And yet, beware their fearsome unelected power. Anyone visiting from Mars last year and asking to be taken to our leader would undoubtedly expect to meet Bernanke.
As a result their public arguments have an incestuous yet masturbatory quality that is exhausting to follow. The only field more self-confidently but just as regularly wrong as economics is nutrition, whose recommendations to shun butter/margarine or red meat/carbohydrates regularly reverse themselves.
Natural scientists (physicists, chemists, biologists) have had frightful power, and not always used it well. But at least they can more or less agree about truth and efficacy. Economists cannot, except by using statistical regressions which are often flawed and prove little.
So I cannot currently bring myself to read over 600 pages by an economist. One day I do hope to read Piketty’s book.