Since 1980, pension plans have been phased out in favor of 401(k) plans. They now represent nearly one-fifth of the U.S. retirement market. So how did 401(k) plans become such a popular form of retirement savings and how should they be used? https://t.co/de0xElyT0a pic.twitter.com/8c7G4nJpta
— CNBC (@CNBC) September 21, 2021