Middle east oil versus oil from Canada.

From the Wall Street Journal:

In sum, it costs under $5 per barrel to pump oil out from under the sand in Iraq, and about $15 to melt it out of the sand in Alberta. So why don't we just learn to love hockey and shop Canadian? Conventional Canadian wells already supply us with more oil than Saudi Arabia, and the Canadian tar is now delivering, too. The $5 billion (U.S.) Athabasca Oil Sands Project that Shell and ChevronTexaco opened in Alberta last year is now pumping 155,000 barrels per day. And to our south, Venezuela's Orinoco Belt yields 500,000 barrels daily.

But here's the catch: By simply opening up its spigots for a few years, Saudi Arabia could, in short order, force a complete write-off of the huge capital investments in Athabasca and Orinoco. Investing billions in tar-sand refineries is risky not because getting oil out of Alberta is especially difficult or expensive, but because getting oil out of Arabia is so easy and cheap. Oil prices gyrate and occasionally spike -- both up and down -- not because oil is scarce, but because it's so abundant in places where good government is scarce. Investing $5 billion dollars over five years to build a new tar-sand refinery in Alberta is indeed risky when a second cousin of Osama bin Laden can knock $20 off the price of oil with an idle wave of his hand on any given day in Riyadh.

That, in a nutshell, is why we buy oil from the middle east.