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According to Sharpe, who is also the founder of Financial Engines, the typical 4% rule recommends that a retiree annually spend a fixed, real amount equal to 4% of his initial wealth, and rebalance the remainder of his money in a 60%-40% mix of stocks and bonds throughout a 30-year retirement period.
What’s more, he shows the price paid for funding what he calls “unspent surpluses and the overpayments made to purchase its spending policy.” According to Sharpe, a typical rule allocates 10%-20% of a retiree’s initial wealth to surpluses and an additional 2%-4% to overpayments.
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The only problem with what academia knows to be right and what’s practical in the field — even by Sharpe’s own admission — is this: “Many practical issues remain to be addressed before advisers can hope to create individualized retirement financial plans that maximize expected utility for investors with diverse circumstances, other sources of income, and preferences,” Sharpe wrote in his paper.
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Meanwhile, Stephen P. Utkus, a principal with the Vanguard Center for Retirement Research, agrees that the 4% rule is flawed. But he also notes, as did Sharpe, that there’s no practical mechanism to replace it with and that further research is required.
I think this is exactly right. The proper personal financial actions in this case are not easy. The 4% rule is far from perfect but it does give a general idea that is a decent quick snapshot. But you can’t rely on such a quick, overly simplified method. At the same time there are simple ideas that do work, such as saving money for retirement is necessary. The majority of people continue to fail to take the most basis steps to save money each year for retirement.
Related: Spending Guidelines in Retirement – How Much Will I Need to Save for Retirement? – Bogle on the Retirement Crisis