Tverberg: "The World Economy Seems To Be Seriously Ill..."
It is because of the laws of physics that debt can play a major role in the economy. Debt can provide time-shifting services if an economy does not have sufficient energy supplies to permit the equivalent of bartering of finished goods and services for new capital goods. Debt can allow future goods and services (manufactured with energy products) to serve as payment for capital goods and other goods purchased using debt. Thus, debt acts as a promise of future energy supplies. These future energy supplies may not, in fact, actually be available at prices that consumers can afford. This is why debt bubbles so often collapse and have a devastating impact on economies.
In theory, the new physics discoveries might also be added to the Limits to Growth model. If this were done, I would expect the downslopes in Figure 3 to be much steeper. Also, the date when the population decline starts would likely move forward, relative to other declines. The actual dates of the declines would of course be expected to change as well, because of updated knowledge regarding resources, population, and other factors.
Including the physics aspect of the economy would lead to many periods when sharp changes take place. When these sharp changes take place, there might be wars, collapsing governments, and epidemics, all causing large numbers of deaths. Debt bubbles might pop, causing deflation and widespread banking problems. These types of events are similar to those that economies have experienced in the past. There is no reason to expect that today’s world economy will have unusual lasting power.
Of course, modeling one piece of the economy at a time, as described at the beginning of this post, leaves out such troublesome implications. Economists tell us all we need to worry about is price fluctuations as the economy substitutes one product for another. If a person has blinders on, perhaps this a good description of the world we live in. Otherwise, the model leaves a lot to be desired.
Implication of the Laws of Physics Being in Charge of How the Economy Operates
Politicians would very much like us to believe that they are in charge. They would like us to believe that adding more technology can solve all of our problems. They would like us to believe that citizens can make a significant difference by voluntarily cutting back on their own energy consumption. They would also like us to believe that countries can cut back on their debt levels without the whole Ponzi Scheme unraveling.