What is your reasoning behind the idea of doublings, as opposed to, say, a long-term linear trend?

Of course, any long term exponential rate of increase results in a series of doublings, i.e., Rule of 72, but my characterization was colored by the recent price history, when we went from $63 in June, 2007 to $125 in June, 2008. In any case, I characterized it this way: $25, $50, $100, $200, $400 . . . with the question being the time periods between the doublings.

Having experienced several price declines, I also knew that prices declines are are not only likely, they are basically a virtual certainty. However, I think that the net export model is going to drive prices higher long term.

I'm just glad that we are still in the same house that we had at $20 oil and that I am still in the same office that I had at $20 oil.