"In scenarios that threaten retirement sustainability ... a declining equity exposure over time will lead the retiree to have the least in stocks if/when the good returns finally show up in the second half of retirement ... With a rising equity glide-path, the retiree is less exposed to losses when most vulnerable in early retirement and the equity exposure is greater by the time subsequent good returns finally show up. In turn, this helps to sustain greater retirement income over the entire time period."

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