Impermanent Loss (IL) is a potential risk unique to providing liquidity in Decentralized Finance (DeFi). It represents the difference in value between depositing assets into a Liquidity Pool versus simply holding those same assets in your own wallet (a strategy often called HODLing). This “loss” occurs when the market price of the tokens in the pool changes after you've deposited them. The more the prices diverge from when you started, the greater the Impermanent Loss. The term is slightly misleading; while the loss is “impermanent” because it's only a paper loss until you withdraw your funds—and could reverse if prices return to their original ratio—it becomes very permanent if you withdraw your assets at a loss. It's essentially the Opportunity Cost you pay for earning trading fees as a Liquidity Provider (LP).
To understand Impermanent Loss, you first need to grasp the basics of how a Liquidity Pool works on a Decentralized Exchange (DEX).
Most Liquidity Pools are managed by a protocol called an Automated Market Maker (AMM). When you, as an LP, deposit your assets, you typically deposit a pair of tokens of equal value, for example, $500 worth of ETH and $500 worth of USDC. The AMM's job is to keep the total value of ETH and USDC in the pool balanced according to a mathematical formula. When a trader comes along and swaps USDC for ETH, the pool gains USDC but loses ETH. To maintain its balance, the AMM automatically makes ETH more expensive relative to USDC. This constant rebalancing is what causes Impermanent Loss. As the price of one asset (like ETH) rises on the open market, the AMM sells off some of that appreciating asset in exchange for the other, less valuable asset (USDC) to maintain its internal balance. This means that as an LP, your share of the pool ends up with less of the high-performing asset and more of the low-performing one.
Let's say you have two choices:
Now, imagine the price of ETH doubles to $4,000.
You still made a profit, but you would have been $344 richer ($6,000 - $5,656) if you had just held your assets. That $344 is your Impermanent Loss. The only way to offset this loss is if the trading fees you earned during this period were greater than $344.
For a value investor, Impermanent Loss is a critical risk factor that must be weighed against potential rewards. The name itself can lull you into a false sense of security—it feels temporary, but it can easily become a permanent dent in your capital.
The entire premise of being a Liquidity Provider is to earn trading fees. A value investor must treat this as a business decision: Do the expected fees provide a sufficient Margin of Safety to compensate for the risk of Impermanent Loss?
If the assets in the pool are highly volatile, the potential for IL is enormous and can easily wipe out any fees earned. This transforms the activity from a form of “earning yield” into pure speculation on price stability.
A prudent investor would approach liquidity provision with caution, focusing on mitigating IL: