This is because if the HFT posts first

This is because if the HFT posts first with a market that is too high or too low, the HFT runs the risk of multiple losing trades because of the speed at which other HFTs will respond to take advantage of their «bad» market. The HFT may then acquire a significant long or short position that is on the wrong side of the market. To overcome this disadvantage the exchanges offer a rebate to those that post of typically 25 cents per 100 shares, and charge a fee to those who take liquidity of typically 30 cents per hundred shares.

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