packed concert schedule, selling tickets to people who may have already binge-watched all of “Below Deck.” The second, however, suggests that people aren’t as eager to get back to huffing and puffing at the gym as they are content to exercise at home. As restrictions lift and people feel safer in crowds, drinking and dancing appear to be higher priorities.

new book, “Noise: A Flaw in Human Judgment,” the Princeton psychology professor and Nobel laureate Daniel Kahneman, along with co-authors Olivier Sibony and Cass Sunstein, argue that these inconsistencies have enormous and avoidable consequences. Kahneman spoke to DealBook about how to hone judgment and reduce noise.

DealBook: What is “noise” in this context?

Kahneman: It’s unwanted and unpredictable variability in judgments about the same situations. Some decisions and solutions are better than others and there are situations where everyone should be aiming at the same target.

Can you give some examples?

A basic example is the criminal justice system, which is essentially a machine for producing sentences for people convicted of crimes. The punishments should not be too different for the same crime yet sentencing turns out to depend on the judge and their mood and characteristics. Similarly, doctors looking at the same X-ray should not be reaching completely different conclusions.

How do individuals or institutions detect this noise?

You detect noise in a set of measurements and can run an experiment. Present underwriters with the same policy to evaluate and see what they say. You don’t want a price so high that you don’t get the business or one so low that it represents a risk. Noise costs institutions. One underwriter’s decision about one policy will not tell you about variability. But many underwriters’ decisions about the same cases will reveal noise.

WSJ)

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