AMMs and Price Impact

Automated Market Makers are algorithmic protocols that facilitate asset trading without a traditional order book by using liquidity pools. Price impact occurs when a trade is large enough relative to the size of the liquidity pool to move the market price of the asset.

Because AMMs use mathematical formulas to determine prices, every trade alters the ratio of assets in the pool, directly influencing the exchange rate for that specific transaction. Larger trades consume more of the available liquidity at the current price, forcing the algorithm to quote a less favorable price for the remainder of the order.

This phenomenon is a fundamental aspect of market microstructure in decentralized finance. It serves as a cost for traders seeking immediate execution without finding a counterparty.

Managing price impact is crucial for large-scale participants who must balance execution speed against the cost of slippage. Understanding this dynamic helps traders design better execution strategies to minimize costs.