Not exactly. Sellers set prices. The question is whether they adjust prices to what the market will bear or not. Overpriced items, as compared to what the normal market will bear, do not well well, but some sellers are comfortable with not selling a lot or are not willing to sell until the price that they set is met by a buyer.
If buyers set prices, I would be getting all my stuff for free.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011