Impermanent Loss concept
Overview
Impermanent loss refers to the shortfall incurred by a liquidity provider in an automated market maker compared to merely retaining the deposited tokens. This deficit arises from the pool's rebalancing as the relative price of the assets shifts. When external market prices change, arbitrageurs trade against the pool, causing the provider to end up with a greater quantity of the asset that declined in value and a smaller quantity of the asset that appreciated. The term 'impermanent' indicates that the loss vanishes if prices revert to their initial ratio, yet it becomes permanent upon the provider's withdrawal. Larger price movements result in greater losses, though providers can offset these with accrued trading fees when pool activity is elevated.
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Questions on the record
Why is the loss termed 'impermanent'?
The loss reverses if token prices return to their original ratio; it crystallises into a realised, permanent loss only upon withdrawal by the liquidity provider.
What is the mechanical cause of impermanent loss?
When the pool price diverges from the external market price, arbitrageurs rebalance the pool, leaving the provider with a greater quantity of the depreciating asset and a smaller quantity of the appreciating asset compared to a simple hold strategy.
Can liquidity providers compensate for impermanent loss?
Yes—sufficient swap volume can generate fees that offset or exceed the impermanent loss, though this outcome is not assured.