Question: what is our nation's biggest source of retirement income?
Answer: Social Security. According to a recent Gallup survey of 1,020 Americans, 54 percent of retirees say Social Security is a major source of income. ... 
Retirement accounts. ... 
Pensions. ... 
Savings accounts and CDs. ... 
Stocks and stock mutual funds. ... 
Home equity. ... 
Part-time work. ... 
Inheritance.