Have a citation? The claim that a couple of exchanges in china have majority of the mining power seems plausible and I'm willing to accept it as fact on the strength of multiple assertions that it's the case. But the claim that these exchanges, which are presumably composed of the pooled resources of many independent or semi-independent agents are coordinating to prop volume and price (in the face of a collapse) seems to call for a bit more support than a flat assertion.
I think you are confusing bitcoin exchanges with bitcoin mining pools. 2 mining pools have 52% of the hashing power and a responsible for "producing" bitcoins. The exchanges are basically just places to buy and sell bitcoins. With regards to wither or not Chinese exchanges are deceptively manipulating the price of bitcoin I don't have any idea.
You're right. I momentarily confused the two terms. I could see how a couple exchanges, as opposed to pools, would have more unilateral (or bilateral rather) power for manipulating market statistics.
Either way, the main question still remains, and it doesn't look like a citation is forthcoming. Going to file this under unfounded speculation for now.
