What is market volatility?
Market volatility refers to the degree of variation in the price of financial securities over time. For index fund investors, understanding volatility is crucial for maintaining a long-term perspective and making informed investment decisions.
Types of market volatility
Short-term volatility
- Daily price fluctuations
- News-driven movements
- Market sentiment changes
- Usually temporary
Long-term volatility
- Economic cycles
- Market corrections
- Bear and bull markets
- Structural changes
What causes market volatility?
Economic factors
- Interest rate changes
- Inflation reports
- Employment data
- GDP growth figures
Market psychology
- Fear and greed cycles
- Investor sentiment
- Panic selling or buying
- Media influence
External events
- Geopolitical tensions
- Natural disasters
- Regulatory changes
- Global crises
Strategies for managing volatility
Maintain a long-term perspective
Historical data shows that markets have recovered from downturns over time. Focus on your long-term goals rather than short-term fluctuations.
Continue dollar-cost averaging
Regular investing helps smooth out market volatility by purchasing more shares when prices are low and fewer when prices are high.
Stay diversified
Index funds provide built-in diversification, which helps reduce the impact of volatility on your overall portfolio.
Avoid emotional decisions
Resist the urge to buy high during market euphoria or sell low during market panics. Stick to your investment plan.
Historical market volatility
Markets have fallen hard several times in living memory, and in each of these cases they went on to recover:
2008 financial crisis
-37%
S&P 500 in 2008; new highs by 2013
COVID-19 pandemic
-34%
March 2020; recovered within 5 months
Dot-com bubble
-49%
2000-2002; patient investors were rewarded with subsequent growth
Past recoveries do not guarantee future ones, but they show that a decline is not the same thing as a permanent loss unless you sell into it.
Volatility measurement tools
VIX (volatility index)
Often called the "fear gauge", the VIX measures expected volatility in the S&P 500 over the next 30 days.
Standard deviation
A statistical measure that shows how much an investment's returns vary from its average return.
When should you be concerned?
If falling prices make you want to act, the problem is usually psychological rather than financial. Read more on investment psychology, or run your own numbers to see how a full market cycle affects a long-term plan.