"For several decades, people worried about future retirees have argued their case based on broad trends, such as the waning of defined-benefit plans, surveys suggesting that workers don't own enough investment assets, and the ever-increasing length of retirement as Americans live longer. Those are all worthwhile topics, but they represent questions to be addressed, not answers to be delivered. To put the matter another way, unless they are accompanied by specific supporting evidence, demographic arguments are insufficient."

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