Implement spread-based concentrated liquidity pools

[alnoki]

It is proposed that liquidity pools be connected to the Econia order book design, such that pools determine price range based on best bid/ask.

E.g. in uniswap v3, users select a price range in which to provide liquidity. But in this design, there could be a default range like +/- bps relative to best bid/ask.

Hence pool LPs, rather than selecting liquidity provisioning based on prices, and having to reshuffle their profile for market conditions, just select a sort of depth/slippage window that is relative to the order book reference price.

Per @elliottdehn:

If we imagine an order centered on the price such that 50 A is to the left and 50 B is to the right, and an order is placed that shifts liquidity right so that it's 55 A and 45 B, then you don't really have a way to easily rebalance this order especially if it's alone.

More specifically, you need a way to rebalance all of the liquidity affected by a trade which may have crossed multiple liquidity opens/closes so it would be really complicated.

Additionally, there may need to be some kind of hysteresis/DoS prevention that prevents people from stacking the book in a certain way that exploits the pool

Per @elliottdehn a TWAP oracle could be used to determine a price that is less sensitive to manipulation, and note that there is also the question of who pays for the rebalancing operation (this could potentially be implemented as a crank operation)

[alnoki]

Per @elliottdehn the CLMM could use as its price range endpoints the spread, such that pooled liquidity only applies between the best bid/ask

[alnoki]

Here, there would be two regimes for the liquidity pool:

No limit orders: CP AMM (UniSwap v2)
Limit orders: CLMM (UniSwap v3) with the price range endpoints as the spread