What is impermanent loss?
Impermanent loss (IL) is the opportunity cost incurred by liquidity providers (LPs) in automated market makers (AMMs) when token prices diverge after LP deposit. The name “impermanent” reflects that the loss only crystallises if the LP withdraws — if prices return to original ratios, no realised loss occurs. In practice, most LPs experience real economic loss because price movements rarely fully reverse.
The IL math
For a constant-product AMM (Uniswap V2 style), IL relative to holding equals: IL = (2 × sqrt(price_ratio)) / (1 + price_ratio) - 1. Specific values: 25% price change → 0.6% IL; 50% price change → 2% IL; 2× price change → 5.7% IL; 5× price change → 25.5% IL. The loss scales non-linearly — small price movements create minimal IL, but large movements create substantial IL.
Why IL exists
AMMs rebalance positions automatically. If ETH price doubles vs USDC, the AMM sells ETH (the appreciating asset) to maintain the constant-product invariant. The LP ends up with less ETH and more USDC than if simply holding — capturing the rebalancing transactions in the opposite direction of price movement. Trading fees partially compensate, but IL frequently exceeds fee earnings during volatile periods.
Mitigation strategies
Several approaches reduce IL exposure. (1) Correlated pools — stablecoin-stablecoin pairs (USDC/USDT) or ETH/stETH minimise price divergence. (2) Concentrated liquidity — Uniswap V3 lets LPs focus capital in narrower price ranges, increasing fee earnings relative to IL. (3) IL protection products — Bancor V3, certain Curve gauges offer IL insurance through governance subsidies. (4) Single-sided LP — providing only one asset, accepting different risks.
Risk reality check
Despite mitigation strategies, IL remains the dominant risk for DeFi LPs. Studies by Topaz Blue and Bancor research showed that 50%+ of Uniswap V3 LPs realised net losses (fees < IL) over multi-month periods. LP strategies require careful pool selection and price range management — not "passive yield" as often marketed.
Türkiye context
For Türk DeFi participants exploring liquidity provision, IL understanding is essential before deploying capital. The TRY-denominated mental accounting can mask USD-denominated IL when Türk users think in lira terms. CASP-licensed exchanges offering DeFi access products should provide clear IL disclosure given complexity.