It's not the market speculating; it's the market responding to a perceived change in the supply and demand balance.
I want to come back to the question you posed to Ms. Savage about gas prices going up before a long weekend. I share her view that, although there are perceptions to that effect, there's no empirical evidence for them. In fact, an extensive report done by the Conference Board of Canada several years ago came to the conclusion that there was no evidence that prices went up before long weekends.
We will generally see some seasonal differences in prices. As the summer driving season arrives, there is a much increased demand for gasoline, and the supply and demand balance changes. We generally see an increase in the price in the summer.