It was tough enough to save and invest to fund retirement. But once you retire you're confronted with a new and confounding challenge: How to manage a portfolio through unpredictable markets that will generate enough income to meet retirement costs, which may include long-term care, for an unknowable number of years?
"It's the hardest problem in all of personal finance," says Christine Benz, director of personal finance and retirement planning for the research firm Morningstar.
