What Is Volatility?
Volatility refers to the magnitude and frequency of price fluctuations for a financial asset.
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What does volatility mean?
Volatility describes how much an asset’s price fluctuates over a specific period. In Turkish, it is referred to as “oynaklık.” It doesn’t just measure price drops; rapid and significant upward movements also increase volatility. The direction of the price and the magnitude of the movement provide different types of information.
While used colloquially to describe wide price ranges, technical calculations usually measure the distribution of price returns. The result changes based on the period and the frequency of data used. For instance, one-month volatility calculated using daily prices cannot be directly compared to a weekly measurement calculated using hourly data.
Low and high volatility: An example
Imagine two assets that both start the week at 100 units and end at 105 units. While the first asset rises in small, steady increments every day, the second might drop to 80 before surging to 120. Even though their total weekly returns are identical, the second asset experienced much higher volatility throughout the week.
This difference is particularly critical in leveraged trading. Even if the final price is favorable, a position may be liquidated during interim price swings. Additionally, volatility affects the price at which an asset can be sold at the exact moment cash is needed.
Does historical volatility predict the future?
Volatility calculated from historical data summarizes movements that have already occurred. It does not guarantee that the following period will behave the same way. A market that has remained stable for a long time can move rapidly due to security news, a loss of liquidity, or a large order. Low historical volatility does not mean zero risk.
If you see a statement like “volatility is low” for a product, look for the measurement period and the methodology used. Even assets designed to trade within a narrow range, such as stablecoins, can experience massive volatility if they lose their value peg. It is impossible to evaluate all the risks of an asset by looking only at a chart from the last few days.