Retirement plans must include stocks, especially when interest rates remain low, nevertheless, 401ks and IRAs are not for market-timing or day-trading, says Ric Edelman, author of "The Truth About Retirement Plans and IRAs". Edelman says individuals must think long term when it comes to their retirement plans and let diversification do the work as opposed to changing strategies on a daily basis. Finally, he offers tips about systematic withdrawals to prevent people from outliving their money.

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