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The U.S. retirement system gets a grade of C+, so what can be done to improve it? Wharton Prof. Olivia S. Mitchell and others explain the appeal of a national defined contribution plan, paired with guaranteed lifetime incomes, Hear more from CNBC.

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The U.S. retirement system gets a grade of C+, so what can be done to improve it? Wharton Prof. Olivia S. Mitchell and others explain the appeal of a national defined contribution plan, paired with guaranteed lifetime incomes, Hear more from CNBC.