The crude oil market is a world market, but the refined product market is largely a North American one. It is extremely expensive to have inactive capacity that you can just turn up. It's not like electricity; you don't have to meet peak demands at times. So you have a lot of excess capacity to do that.
In terms of refined products, there has been very little new construction of refineries in Canada or the United States. It's just not commercially viable to create more refinery capacity. It's much better to expand what you have, to revamp what you have. What's happened is that the intensity of use of the existing refining capacity has grown a lot in both Canada and the United States. So essentially, when things go wrong—and things happened at a time when the refinery capacity was being switched from the summer run to the winter run, as it turns out, so things happened at the wrong time—there's not a lot you can do to protect yourself that's cost-effective, either from a public policy perspective or a commercial perspective, to meet these kinds of once-in-very-few-times events.
As you know, in Edmonton there have been issues about diesel recently because of refinery problems. These are just the consequences of market arrangements working that way.