In case you haven’t noticed, the price of oil has dropped dramatically and has not rebounded as yet. As I write, the price of the most common form of crude oil is under $54 per barrel, about half of what it was in mid-2014. What’s going on?

Several factors contributed to the fall. One was increased U.S. production, much of it shale oil. Also, U.S. consumption has not been rising apace with GDP in part because of higher fuel efficiency. Demand in Europe and Japan is muted due to low growth or recession.

Those things did not happen suddenly, however, so the drop would appear to be overdone. Large producers, who have a lot of pricing power, would normally cut production in this circumstance. (Pricing power means a change in their production has a noticeable effect on the world price.) The Saudis have considerable pricing power and their production decisions…