Editor’s note: Since this episode first aired, researchers have raised concerns about a number of studies authored by Dan Ariely, including one cited in this episode. That study included data from an insurance company that purported to show that people are more truthful when they sign an ethics declaration at the beginning of a form than at the end. In an independent review, a group of researchers found evidence of data fabrication in that study. You can read more about their findings here, along with Dan Ariely’s response. The insurance company that provided the data, The Hartford, released a statement to NPR’s Planet Money in July 2023. In that statement, the company said that it had done a review of its records and that “there appear to be significant changes made to the size, shape and characteristics of our data after we provided it and without our knowledge or consent.” You can hear the full Planet Money story and read the full statement from The Hartford here.

Additionally, a second study cited in this episode – in which Ariely reported reduced cheating among test-takers asked to recall the Ten Commandments before taking the test – has not stood up to replication by other researchers. You can read more about that here.

We all lie. But what separates the average person from the infamous cheaters we see on the news? Dan Ariely says we like to think it's character — but in his research he's found it's more often opportunity. Dan Ariely is a professor at Duke University and the author of the book, The Honest Truth About Dishonesty: How We Lie to Everyone — Especially Ourselves. We spoke to him in March 2017.

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