So a bunch of stuffs could be unloaded in one dark pool, but those in public stock exchange or other dark pool venues do not know what is going on. People may trade things assuming their price is high, but in reality, it can be low.
Price as a market signal for demand and supply breaks down.
Nah.. all they can hide is volume. Prices won't be different as different prices create an arbitrage opportunity that these quants would quickly make disappear.
Sounds like what's happening with oil - but I don't believe this is done with commodities, is it?