I don't understand why prices are continuously fluctuating. Our local pricing structure runs on about a 3 week cycle. The price will max out literally overnight, then trickle down slowly a few cents each day over about a 3 week period, then spike back up again. This cycle has been doing this for several years now. I see nothing on the supply side that would cause this type of a pricing cycle. Why don't they just pick an average price between the high and low, and just leave the price there? What drives this type of yo yo pricing?