Impermanent Loss Explained (and How v3 Ranges Change It)

Impermanent loss is the tax nobody mentions in yield screenshots — the reason an LP position can lag simply holding the same assets. It sounds paradoxical and scares people off unnecessarily, because once you see the mechanism, it becomes a knowable cost you can price against fees. Let's demystify it.

The mechanism in plain language

A pool rebalances automatically as prices move — that's what an AMM is. When the token pumps, traders buy it out of your pool, leaving you holding proportionally more of the other asset. When it dumps, the pool accumulates the falling token.

Notice the pattern: the pool systematically sells your winner early and buys your loser on the way down. The gap between your rebalanced position and just-holding is impermanent loss (IL).

Rules of thumb: a 2× move in one asset costs roughly 5.7% versus holding; 4× costs about 20%. Small moves cost almost nothing — IL grows with divergence, not with time.

Why "impermanent"?

If prices return to your entry ratio, the loss vanishes — the rebalancing walks itself back. It only becomes permanent when you withdraw while diverged. That's not comfort, just precision: plan exits, don't pray for round trips.

The real question: fees versus divergence

IL is the cost side of LPing; trading fees are the revenue side. The position wins when volume × fee tier outruns divergence:

• High-volume, mean-reverting pairs — the LP sweet spot: constant fee flow, oscillation instead of trend.
• Stable-ish pairs — minimal divergence by construction, so nearly every fee is profit.
• Moonshot-or-zero tokens — the worst LP candidates: you'll underperform the moon and ride the zero.

What v3 ranges change

Concentrated liquidity doesn't abolish IL — inside your range, rebalancing is actually faster. What changes is the deal around it:

• Far more fees per dollar while price is in-range — the revenue side grows to fight the cost side.
• Divergence capped by your range. Price beyond your band leaves you fully converted but no further rebalanced — you chose your worst case in advance.
• One-sided positions reframe IL entirely. A single-token range above the market converts your token to USDX as price rises — "selling on the way up, paid fees to do it." If you wanted to sell there, the "loss" is a limit order executing profitably.

That last point is the mental unlock: IL is only loss relative to holding. If your range expresses a plan — sell here, accumulate there — the rebalancing is the plan.

A sane LP checklist

1. LP pairs you're happy holding either side of.
2. Prefer volume and mean-reversion over trending rockets.
3. Set ranges that express real intent, not maximum APR screenshots.
4. Collect fees regularly and judge the position by total return versus holding.

Priced honestly, IL stops being a trap and becomes what it always was: the spread you pay to run a market-making business.