The Good, the Bad, the Ugly of Target-Date Retirement Funds
Enterprising Investor - A podcast by CFA Institute

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In episode #148, Thomas M. Idzorek, CFA, discusses the problems associated with benchmarking these instruments and outlines a glide path stability score. Although target-date retirement funds are a ubiquitous retirement planning tool, their glide paths vary considerably from one provider to the next. Moreover, the glide paths themselves tend to change over time.