Tverberg: "The World Economy Seems To Be Seriously Ill..."
The Real Nature of the Limits to Growth Problem
To truly understand the headwinds that the economy is facing, we should be looking at the combined effect of all of the limits that the individual specialists have been studying. We might also include other issues not listed. The 1972 book The Limits to Growth presents an early computer model of how at least some of the limits of a finite world might be expected to play out.
Figure 3. Base scenario from 1972 Limits to Growth, printed using today’s graphics by Charles Hall and John Day in “Revisiting Limits to Growth After Peak Oil” http://www.esf.edu/efb/hall/2009-05Hall0327.pdf
This early approach reflected an engineering view of the problem, considering expected diminishing returns with respect to resources of all types. Other considerations included likely resource needs based on prior economic and population growth trends and efficiency gains. The Base Scenario shown in the 1972 book (Figure 3) showed collapse taking place about now–in other words, in the early part of the 21st century.
In the time since the 1972 Limits to Growth analysis was prepared, there has been a major discovery relating the importance of energy to the economy. Ilya Prigogine tackled the problem of the physics of thermodynamically dynamic open systems, earning a Nobel prize for his efforts in 1977. When energy flows are available, many structures, called dissipative structures, can grow and change over time. Examples include plants and animals, hurricanes, stars (they expand in size, then collapse at the end of their lives), ecosystems, and economies. These structures are utterly dependent on energy flows. The economy needs energy in almost the same way that humans need food. Without sufficient energy flows, the world economy will collapse.
It is because of the laws of physics and energy flows that markets are able to set price levels. Indirectly, physics sets the maximum affordable price for energy products based upon the total quantity of goods and services individual workers can afford. These maximum affordable prices may be invisible, but they are very real. Economists may talk about “demand” for energy products, but the real issue is affordability: “Will the laws of physics allow prices to stay high enough to provide the commodities the world economy needs?”