Corrections and bear markets inflict harm on countless individuals who throw in the towel and lock in their losses.
In a classic correction, the broad market averages lose 10% to 20% of their value, whereas they plunge 20% to 35%, or more, in a real bear market. Some equity funds get hit worse than others in a bear rout.
In addition to short-term risk, there's always a small chance that stocks can do poorly for about a decade introducing a long-term danger.
This peril confronts investors directly, especially those in longer-term portfolios. Simply put prices fall when interest rates rise.
If interest rates rise significantly, fixed-income securities become relatively more attractive, so money is shuttled from the stock market into higher-yielding bond and money market funds.
If your country's currency grows stronger, you will experience a currency loss on your foreign securities. Conversely, if your currency weakens, you will enjoy a bonus.
Fluctuating exchange rates are of particular concern to single-country investors. It can be devastating for individuals who hold funds for short periods.
Some fund managers may try to hedge their portfolios against adverse currency moves with currency futures or forward contracts. However, hedgers are fallible and lose money when the currency goes opposite their predictions.
In addition, a hedge costs money.
Currency risk is generally not too much of a problem for long-term investors in well-diversified international funds.
Stocks, bonds, and cash are the three major asset classes.
If you allocate a disproportionate amount to any of the three main categories, or totally ignore one or two of them, you are subject to asset-class risk.
It's prudent to diversify across all three major asset classes even though you want to give primary emphasis to, say, stocks.
The majority of actively managed funds underperform the broad market benchmarks.
Even though a fund has beaten the market in the past, there are no guarantees it will continue to do so.
A star manager may leave or lose his touch.
Individuals who stick with poorly run funds risk substantial under performance, which can compound over time.
Investors in index mutual funds avoid management risk.
Industry or sector risk faces those who invest in narrowly focused sector portfolios, such as those focusing on health care or even utility stocks.
It also affects individuals holding more diversified funds that make big sector bets.
This danger, which includes economic and political instability, is associated with single-country investments, especially those targeting developing markets.
The risk of default can be a concern for high-yield bond fund investors.
Junk bonds can experience staggering losses when setbacks occur in this sector.
Investors have to be cautious in changes in tax laws that could make their holdings less valuable.