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Comment Re:How is this necessary? (Score 1) 275

The bullshit part is that the additional liquidity HFT provides is conditional on there already being sufficient liquidity.

Well, that's true of any other source of liquidity, unless you have someone trading just for the sake of generating liquidity. It works all the same.

Not exactly. Market makers are required to guarantee liquidity in certain exchanges. Also, people buy and sell for other reason than short term trading. The point being that when there is sufficient liquidity for HFT to exist there is very little value left in additional liquidity that HFT can provide. And when it would be very valuable for HFT to provide additional liquidity they provide no additional liquidity at all, sometimes proceeded by amplifying volatility before ceasing thier trading.

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