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There is no point manipulating up. I’d they manipulate the price it will be in both directions!

They are going to manipulate both ways. They're used to taking out stop-losses left and right.

Also, if decentralized exchanges ever get enough volume, they'll be able to front run them a la "Flash Boys"

That won’t always be the case. Say then need to fill a order at a certain prices. They have the power to crash down and hold until they get what they want.

Could cause for more headache