On Wed, 09 Mar 2011 10:10:50 -0800, jps wrote:

Supplies have been going up since the start of the year, and so is the
price. That's nothing to do with supply/demand but speculation.

Who owns those supplies and why did they build their inventories?
You might be surprised to learn that the motives might have more to do
with availability than price. If so, that's commendable . No one
wants to be caught short or stuck in lines at the station. In any
case, building inventories is a self limiting process because there is
only so much capacity.