Liquidity

Key points

• Liquidity is the ease of buying or selling an asset without causing a significant price change, something essential for operating with predictable cost.
• A liquid market has many orders close to the current price, so even large trades move the quote very little.
• Low liquidity makes trading more expensive indirectly, because the price shifts as the order is executed.

What is liquidity?

Liquidity is the ability to trade an asset quickly and at a price close to the market price. The more participants willing to buy and sell near the current price, the more liquid the asset is. Cash in an account is the most liquid example; real estate is the opposite, because selling takes time and the price can vary a lot depending on how urgent the sale is.

How it works

In markets with an order book, liquidity shows up as the volume of buy and sell orders stacked around the price. A deep book absorbs large orders without the price shifting much. A shallow book does the opposite: a larger order consumes the best available prices and ends up executed, on average, at a worse value.

In decentralized finance protocols, liquidity usually comes from pools funded by users, the liquidity providers, who deposit assets and receive a share of the trading fees. The larger the pool, the smaller the impact of each swap on the price, meaning lower slippage.

Liquidity is not fixed: it varies by time of day, by interest in the asset, and by market conditions, and it tends to dry up precisely during moments of stress, when it is needed the most.

Why it matters

For anyone who needs to convert amounts, liquidity determines the real cost of the operation, often more than the fee charged. A company moving significant amounts prefers liquid assets and markets, such as the main stablecoins, because that way it can convert close to the reference price, without surprises in execution.

Risks and limitations

Illiquid assets may look cheap to trade based on the fee, but they hide a high cost in price impact. In moments of panic, liquidity disappears and spreads widen, making it harder to exit positions. Concentrating liquidity among few participants also creates fragility, since the exit of a large provider affects the entire market. Assessing an asset's real liquidity before trading, and not just its price, avoids surprises when buying or selling.