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Shankar Vedantam

Economic theory rests on a simple notion about humans: people are rational. They seek out the best information. They measure costs and benefits, and maximize pleasure and profit. This idea of the rational economic actor has been around for centuries.

But about 50 years ago, two psychologists shattered these assumptions. They showed that people routinely walk away from good money. And they explained why, once we get in a hole, we often keep digging.

Are you racist?

It's a question that makes most of us uncomfortable and defensive.

Harvard University psychologist Mahzarin Banaji says while most people don't feel they're racist, they likely carry unfavorable opinions about people of color — even if they are people of color themselves.

Banaji is one of the creators of the Implicit Association Test, a widely-used tool for measuring a person's implicit biases. She says it's important to acknowledge that the individual mind sits in society.

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STEVE INSKEEP, HOST:

What are the lives of the planet's wealthiest people really like?

Several years ago, sociologist Brooke Harrington decided to find out.

She knew she'd have a hard time gaining access to the world of the über wealthy, so she did something unusual: She took courses to become a wealth manager.

In the course of this training, Harrington met other wealth managers, who agreed to be interviewed for her research.

She discovered that, in order to manage money for the super-rich, these professionals learn a lot about the private lives of their clients.

No one will deny that marriage is hard. In fact, there's evidence it's getting even harder.

Eli Finkel, a social psychologist at Northwestern University, argues that's because our expectations of marriage have increased dramatically in recent decades.

"[A] marriage that would have been acceptable to us in the 1950s is a disappointment to us today because of those high expectations," he says.

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