Price Volatility??

According to the Red Book, commemoratives are a series that has experienced a rollercoaster of pricing volatility over the last 20 years or so. Since I haven't collected coins that long, I'm curious if this is true and if other series have more or less volatility.
Who's been collecting long enough to have experienced wild ups and downs in the coin market and which series have the most or least volatility?
Thanks.
Who's been collecting long enough to have experienced wild ups and downs in the coin market and which series have the most or least volatility?
Thanks.
When I was a child, I caught a fleeting glimpse
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Coin's for sale/trade.
Tom Pilitowski
US Rare Coin Investments
800-624-1870