"On the one hand, classical economics seems to have been developed with an almost complete lack of consideration of the role of energy. For example, I have a college level Macroeconomics textbook by my side. It devotes about two out of 519 pages to consideration of energy, wherein it says nonsense like:

Because energy constitutes a small proportion of the nation's total expenditure on inputs, most statistical studies suggest that higher energy prices did not contribute much to the slowdown [in the 1970s].

My Microeconomics textbook is even worse: energy is not in the index. The reasons for this lack of consideration have been understandable in the past, as I will discuss later, but I believe will pose serious problems in the future."

This shouldn't surprise you.  Laissez-faire economics is not based on any kind of reality.  It is nothing more than a modern religion, a "MEANS OF CONTROL".  Read up on Francois Quesnay and the origins of the physiocrats...

==AC

"Historically, this pattern is a familiar one. Kings and emperors of bygone days were always backed up by priests and religions whose job it was to promote an ideology which served the interests of the ruler. The Roman Emperor Constantine and the English King Henry VIII both replaced state religions so as to better suit their political objectives. Today we don't have royal rulers in the West, but we have a ruling elite. Mainstream economists, trained in business school cloisters, function as a priesthood for this elite - muttering unintelligible technical incantations and then declaring absurdities to be truth. The corporate mass-media reinforces the orthodoxy in a thousand ways every day - in news and commentary and even in entertainment fare. Mumbo jumbo has served rulers down through the ages, and it is still being used today. As science or as common sense, the laissez-faire orthodoxy stands on a par with the belief in a flat Earth."
http://cyberjournal.org/cj/guide/world_today.shtml

I happen to think classical economics has an enormous amount of useful insights into the world, but some blind spots also. I think (as I'll articulate in a later post) the reason they've been able to underplay the role of energy is because EROEI has been so high on oil/coal in the past. Thus society only had to put a very modest proportion of its effort into securing further energy supplies. Hence the energy industry has been a small proportion of GDP, which means (some) economists have viewed it as not that important. To look at it as a biologist might, energy has been nowhere near the bottleneck for the economy (in a Liebig's law sense, and so growth theory could safely neglect it - focussing instead primarily on the role of labor and capital as inputs to the economy).
One of the best energy economists is Ayres (http://www.iiasa.ac.at/Research/ECS/IEW2003/Papers/2003P_Ayres.pdf). He has shown that the net effective energy is dominant factor in economic growth.

Energy is not only a constraint, it is the real driving force in economic growth. Its price or share of GDP is another matter. Classical economic s
is just what it sounds, classical. It means it has been developed at a time when economic growth was very slow and it models basically a static economy. The world has experienced sustained, long term rapid economic growth only about 50 - 60 years (this is at the level of 3 - 6% a year).

But here we speak about energy, not only oil. The '70s is an interesting period: the oil consumption really decreased considerably. But the total energy consumption did not. There was probably a small drop at the time of world energy crisis but otherwise constant growth. A sizable part of oil consumption could be substituted by natural gas, nuclear energy and coal. But now? This would be much more difficult.  

I am much enamoured of Ayres' thinking at present. But I'm afraid I'm going to have to get there at a slow plodding tutorial pace in the hope of bringing a broader audience along. I don't think the significance of Ayre's work can be appreciated without some grounding both in physics and in economics (which I hope to supply here as I go).