When an economist says the evidence is "mixed," he or she means that theory says one thing and data says the opposite.
Retirement savings is probably behavioral economists' greatest success story. It is a prototypical behavioral-economics problem because saving for retirement is cognitively hard - figuring out how much to save - and requires self-control.
The lesson from behavioral economics is that people only save if it's automatic.
Everyone's lost a lot of money on their 401k plans. I've heard some people calling them 201k plans. So it's even more important to get people to be saving more for retirement. Behavioral economics has helped us learn a lot about how to do that.
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