Liquidity and volatility differ | Canvas of Knowledge

Movement versus execution

Volatility describes variation in prices over time. Liquidity concerns how readily a position can be bought or sold, including the available quantity and the effect of the order on execution prices. These concepts are related, but they are not interchangeable. An active market can experience large price changes, while a quiet-looking price series does not prove that substantial orders can be filled easily.

Read both sides

The bid is the price a buyer currently offers; the ask, or offer, is the price a seller currently requests. Their difference is the bid–ask spread. CME identifies spreads, trading volume, open interest and order-book depth as useful liquidity measures. Depth matters because an attractive displayed price may cover only a small quantity. The quantity behind a quote helps explain whether a larger order can receive that price.

A hypothetical round trip

Suppose silver is quoted at a $29.95 bid and a $30.05 ask per troy ounce, with enough quantity available. Buying 100 ounces at the ask costs $3,005. Immediately selling those ounces at the unchanged bid returns $2,995. The difference is $10: 100 × ($30.05 − $29.95). That is the spread cost of the complete round trip, before commissions and other costs, even though the quoted market has not moved.

The fill depends on conditions

Execution can differ from a displayed quote if prices change or the required quantity exceeds what is available. CME's order guidance explains that a limit order sets an acceptable price boundary but may remain unfilled. During uncertain conditions, market makers' assessment of price risk can also affect spreads. Neither a recent transaction price nor high trading volume guarantees a particular execution price for the next order.

FOLLOW THE EVIDENCE

Sources & further reading

Sources checked 14 November 2026. Reference organisations do not endorse this website. Price examples are hypothetical and educational.