(OurFiniteWorld.com) The traditional understanding of supply and demand works in some limited cases–will a manufacturer make red dresses or blue dresses? The manufacturer’s choice doesn’t make much difference to the economic system as a whole, except perhaps in the amount of red and blue dye sold, so it is easy to accommodate.
A gradual switch in consumer preferences from beef to chicken is also fairly easy to accommodate within the system, as more chicken producers are added and the number of beef producers is reduced. The transition is generally helped by the fact that it takes fewer resources to produce a pound of chicken meat than a pound of beef, so that the spendable income of consumers tends to go farther. Thus, while supply and demand are not independent in this example, a rising percentage of chicken consumption tends to be helpful in increasing the “quantity demanded,” because chicken is more affordable than beef. The lack of independence between supply and demand is in the “helpful” direction. It would be different if chicken were a lot more expensive to produce than beef. Then the quantity demanded would tend to decrease as the shift was increasingly made, putting a fairly quick end to the transition to the higher-priced substitute.
A gradual switch to higher-cost energy products, in a sense, works in the opposite direction to a switch from beef to chicken. Instead of taking fewer resources, it takes more resources, because we extracted the cheapest-to-extract energy products first. It takes more and more humans working in these industries to produce a given number of barrels of oil equivalent, or Btus of energy. The workers are becoming less efficient, but not because of any fault of their own. It is really the processes that are being used that are becoming less efficient–deeper wells, locations in the Arctic and other inhospitable climates, use of new procedures like hydraulic fracturing, use of chemicals for extraction that wouldn’t have been used in the past. The workers may be becoming more efficient at drilling one foot of pipe used for extraction; the problem is that so many more feet need to be drilled for extraction to take place. In addition, so many other steps need to take place that the overall process is becoming less efficient. The return on any kind of investment (human labor, US dollars of investment, steel invested, energy invested) is falling.