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QFI

Pools can be public or private. Private pools are quite simple - only the user who creates the pool may deposit and withdraw from it. The construction and function of these pools is straightforward.

For public pools, there is added complexity to ensure users are fairly compensated for the amount of ETH deposited and the growth (or loss) of value over time. That is, users' profits and losses are calculated based on when they deposited and when they withdrew the funds accordingly, as it should.