My remarks:
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large positions are more often found on lower tier pools because LP know that those positions will have to actively move it (which is costly, which in turn is not feasible if your position is small) – this hypothesis can and should be validated
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APY comparison using volume/tvl between different fee tier pools is almost useless given different liquidity distribution in different pools. One way to compare it is to compare “price path” (accumulated price change) adjusted for fee tier between pools.
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If the goal of enabling fees is to increase volume and Uniswap is already dominant in AMM space (in terms of volume), what would be the source of this volume?