Small investors should beware of rising interest rates, a regulatory group warned Thursday.

The Financial Industry Regulatory Authority issued an “investor alert” warning individuals that their fixed-income holdings could lose value if interest rates rise.

With interest rates hovering near record lows, a wide range of experts worry that small investors are not prepared – financially or emotionally – for the eventual likelihood that rates will rise.

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In general, an increase in the rates being paid on newly issued bonds, such as popular U.S. Treasury securities, erodes the value of older bonds.

If a newly issued bond pays a 3% interest rate, it makes sense that an older security yielding 2% is not worth as much. In other words, if an investor needed so sell a bond or exit a bond mutual fund, they could suffer an unexpected loss.

But any fall in the value of their fixed-income holdings could jar small investors who have huddled into their supposed safety in recent years and don’t understand the potential risks.

The warning by FINRA, a Wall Street trade group that also polices the markets, focuses on a market gauge known as “duration,” which attempts to forecast the potential impact of rate changes on a portfolio.

In general, according to the alert, a bond mutual fund with a 10-year duration will decrease in value by 10% if interest rates rise 1%.

“With interest rates hovering near all-time lows, investors should make sure they know their duration numbers,” Gerri Walsh, FINRA vice president of Investor Education, said in a statement. “Whether investors own individual bonds or bond funds, they need to understand that outstanding bonds with a low interest rate and high duration may experience significant price drops if interest rates rise.”

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