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Are Certificates of Deposit worth it compared to investing in the stock market?
Growth is how well the investment will grow on average.   In the long term, this is a sure thing.  Volatility is how much the value will jerk up and down in the short term.   Do you want both... Or neither?  When are you going to use the money? If it's IRA money you can't touch for 30 years, it really ought to be in the market, since growth is hugely important, and volatility is not a big concern. You're in it for the very long game, and volatility will average out, leaving pure growth.  If the market drops 25% in 6 months, who cares?  Stocks go up, stocks go down. It has 29 years to recover, and it will.   If you are planning to buy a house in 6 months, you want that money in something like a CD, because volatility could be devastating: an untimely 25% drop in stock price could really, really suck.