> I'm kind of an idiot with anything terribly elaborate in the financial world, so forgive a bit of a dumb question: what are the downsides to bonds instead of using something like a CD?
CDs, TIPS (Treasury Inflation Protected Securities), MBS (Mortgage Backed Securities), Munis, Corporates... these are all so called "debt instruments".
Your question is roughly equivalent to "What is the downsides to investing into Stocks instead of AAPL??" Well... sometimes AAPL goes up, sometimes it goes down. Stocks are... well... AAPL -IS- a stock.
Similarly, CDs are typically a specific kind of bond: the type you get from a bank. But banks also sell traditional bonds.
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The main benefits of CDs is that they're (usually, but not always) FDIC insured. So if the bank goes bankrupt, the US Government steps in and will give you your money back.
The main benefits of "bonds" (which are a very, very broad category consisting of literally thousands, maybe millions of different things)... is that typical bonds can be sold on the open market.
That means that if the interest rates go down, you can sell bonds at a higher price. (Look, I have a 5% bond, and all you suckers are stuck getting 0.5%. Feel like trading? I'll sell you my $10,000 5% bond to you for $11,000.)
Of course, if interest rates go up, then bonds lose value. (Shoot, I have a 0.1% bond and everyone else has 0.5% bonds. I don't want to be stuck with this anymore, feel like buying this $10,000 bond off of me for $8500?)