Oil prices fell slightly Monday - stopping at just over $54 a barrel. But don't get too excited. Demand is expected to keep the price of oil high in the coming months. There's also a scarcity problem. Not of the fuel itself, but as Marketplace's Jeff Tyler reports, there's a shortage of refineries to turn oil into usable gasoline. Meanwhile, not everyone buys into the theory that high oil prices are here to stay. Commentator Vijay Vaitheeswaran says don't bet on it.