Printing / borrowing money to generate the unsustainable illusion of “growth” sets up the collapse of the entire Keynesian edifice.

Of the many delusions of modern economics, perhaps the greatest is that the dominant Keynesian model reflects permanent dynamics of advanced economies. Economics, along with other social sciences, makes an implicit claim that its econometric claims are the equal of the “hard sciences” of physics and chemistry.

In other words, the econometrics of Keynesian economics is presented as possessing the same timeless validity of the natural sciences.

The reality is that Keynesianism arose in an era of abundant cheap energy, and it is an artifact of that brief one-off period in which industrialization, consumption and the human population were able to expand by leaps and bounds due to cheap energy and new technologies that leveraged greater value (“work,” output) from the cheap energy.

Once energy is no longer cheap or abundant, the Keynesian model of paying people to dig holes and fill them as a means of boosting “aggregate demand” falls apart. In the Keynesian model, “growth” as measured by consumption (gross domestic product) is assumed to be permanent and the highest goal of any economy.

If an economy starts contracting (i.e. recession), the one-size-fits-all solution in the Keynesian model is to boost consumption, i.e. “growth” by any means available: paying people to produce no useful output (building bridges to nowhere, etc.), distributing newly created money via “helicopter drops” into consumers' laps via tax rebates, tax cuts, increased social welfare spending, etc.

This “solution” implicitly assumes the energy needed to fuel this unproductive labor, investment and consumption is permanently abundant and cheap. It also assumes that the quantity of energy available to fuel the economy will always expand, and as a result new currency (“money”) can be issued by central banks with few (if any) constraints.