When an economist says the evidence is "mixed," he or she means that theory says one thing and data says the opposite.
Most economists, including me, agree that longevity insurance would make sense for a lot of people.
I think one lesson we have to learn is that there's a lot more risk than we're giving credit to, a lot more what economist calls systematic risk.
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.
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