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What are the benefits of investing to IRA/Roth IRA, 401(k) in comparison to investing in long term CDs?
For the period 1950 to 2009, if you adjust the S&P 500 for inflation and account for dividends, the average annual return comes out to exactly 7.0%. Source. Currently inflation is around 2%.  So your 2% APY is a 0% real return where the stock market return is 7%.  I.e. on average, stocks have a return that is higher by 7.   If you mix in bonds, 70% stocks to 30% bonds, your real returns will drop to around 5.5%, but you are safer in individual years (bonds often have good years when stocks have bad years).   We're making a bit of a false dichotomy here.  We're talking about returns on stocks in retirement accounts versus returns on CDs in regular accounts.  You can buy stocks in regular accounts and it is legally possible to have a CD in a retirement account.  So you can get bankruptcy protection and tax advantages with a CD.