Why the prices are fixed in the whole sale markets.?

Answer 1

The largest wholesale market in the world is the NY Mercantile Exchange (NYMEX). Prices for futures in dozens of commodities from tankers full of oil to stock yards full of hogs are bid upon by thousands of corporations and individuals. Prices are set by the market and may change many times per minute.

In light of this, your question makes no sense.

Answer 2

As I understand the question, you mean the prices of one type goods remain constant at a specific time in the whole sale market.

If it is so then in fact the big business men run the whole sale market and play a major role there so it remains permanent same for a specific time subject to condition of quality and other specification of the goods.

If some one violate the market for his own benefits, the markets association takes action so that both buyers and sellers could keep trust upon the market rates and the prices could remain suitable for the people through out the area, town or city.

So the rates of each item of the goods open accordingly and which may change timing-wise schedule but the fluctuation in prices is found in the retail market not in the whole sale market.