Daniel Kahneman Testimonials

For policy wonks and “nudge nerds”, a good collection of testimonials to the impact of Daniel Kahneman’s work, summarized in his best-selling book, Thinking Fast and Slow. One example from Richard Thaler and Sendhil Mullainathan:

Kahneman and Tversky’s work did not just attack rationality, it offered a constructive alternative: a better description of how humans think. People, they argued, often use simple rules of thumb to make judgments, which incidentally is a pretty smart thing to do. But this is not the insight that left us one step from doing behavioral economics. The breakthrough idea was that these rules of thumb could be catalogued. And once understood they can be used to predict where people will make systematic errors. Those two words are what made behavioral economics possible.

Consider their famous representativeness heuristic, the tendency to judge probabilities by similarity. Use of this heuristic can lead people to make forecasts that are too extreme, often based on sample sizes that are too small to offer reliable predictions. As a result, we can expect forecasters to be predictably surprised when they draw on small samples. When they are very optimistic, the outcomes will tend to be worse than they thought, and unduly pessimistic forecasts will lead to pleasant but unexpected surprises. To the great surprise to economists who had put great faith in the efficiency of markets, this simple idea led to the discovery of large mispricing in domains that vary from stock markets to the selection of players in the National Football League.

ON KAHNEMAN | Edge.org.