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Market makers will not be able to have competitive spreads or cancel their orders to update their strategies.
It will be difficult for them to provide liquidity on the platform, which will hurt the platform overall.
In traditional finance market makers turn a profit through the spreads they offer. If the market moves to one side or another they can quickly cancel their limit orders and update their order books accordingly.
Since all orders will appear on chain, bots can frontrun cancellation orders by the market makers to get a cheap price (and maybe even sell on the updated market makerβs order book), thus disincentivizing market makers from providing liquidity.
Hard to say what a proper mitigation could be. A possible solution: If limit orders have an expiry deadline, (e.g. like what uniswap does to with incoming transactions) then this problem would be diminished.
Another similar thing to note: market makers will have to use large amounts of gas to keep updating their limit orders (whether or not a deadline or other mitigation is included). As long as the contracts are fully on-chain, not much can be done about this.
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