With all of the news about low 401(k) balances and half of the people in the country not being offered either a 401(k) or a pension plan, amazingly, an estimated 10% may be saving too much for retirement. That’s according to the estimates of Harvard University economist David Laibson.

About one in 10 have more than they need to retire on 70% to 90% of their pre-retirement income, but don’t know how lucky they are, Laibson tells Bankrate.com. He includes Social Security and home ownership in his calculations, along with 401(k)s and pension plans.

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