Oil moved above $46 yesterday. According to The New York Times, "One year after crude oil eclipsed $100 a barrel for the first time, the new year's trading began Friday with prices roughly half their year-earlier levels, and some believe oil could be headed even lower."

It is hard to make a bull case for oil, but not as hard as some imagine.

The stock market yesterday signaled that investors think that the economy is making a bottom and that perhaps the second half of the year will actually bring a recovery. If oil traders buy into that, they will begin to trade futures up. It is a fair assumption that an improving economy will require more crude.

Another, more obvious, reason is that OPEC will cut supply until prices go up. Some oil producers, both inside and outside OPEC, need the money from crude sales to keep their economies from sharp contraction. Russia and Venezuela are high on that list.

People watching the news think the war in Gaza will push prices up by interrupting demand. This is only true if Iran becomes involved and its territory is attacked. That is a long shot.

The large exporter that is very likely to see political turmoil that will cut its production is Nigeria, which is almost never mentioned in the debate over oil prices. Rebels cut supplies there several times last year. Only last week, a well-know militant was arrested by the government. That act could certainly lead to growing rebel activity to hurt the government. Hitting pipelines is not terribly hard. Defending thousands of miles of them is impossible.

The price of oil? Watch Nigeria.

Douglas A. McIntyre is an editor at 24/7 Wall St.