By the end you will know what changed when LPs could choose a price range, why it made pools dramatically more efficient and LPing dramatically harder, and what out of range really means.
Every city has this vendor. The cart is never where you left it yesterday: it is wherever the crowd is today. Office corner at lunch, stadium gate at night.
CP8's booth served the whole street evenly, even the dead ends. In 2021, Uniswap v3 asked LPs a vendor's question: why park where nobody walks? This lesson is what happened when the booth learned to move.
Here is CP7's pot, drawn as a street. A v2 pool spreads its liquidity across every possible price, from zero to infinity. That flat line is the booth serving the entire street at once, including the ends nobody visits.
Now look where the crowd stands. Trading happens near the current price, almost all of it, almost always. The far reaches of that line hold real money that may never serve a single trade. Most of the pot never works a day.
The v3 idea, function first: let each LP pick two prices and say, my money serves trades only between here and here. Nothing added, nothing borrowed. The same capital, pulled off the empty ends and stacked at the busy corner.
The pool becomes far deeper exactly where trades happen, so the same trade moves the price less. The name came after the function: concentrated liquidity. The vendor stopped serving the street and started following the crowd.
Pick your two prices and the board draws them as a shaded band around the market. The name: a range. Inside it your cart is parked in the crowd: every trade at these prices uses your liquidity, and you collect a far bigger share of the fees than the same money ever earned in v2.
But bands have edges, and crowds move. Before we watch it happen, place your bet.