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Frederick Soddy’s Debt Dynamics

Frederick Soddy’s Debt Dynamics

In the field of ecological economics, Frederick Soddy looms large. Born in 1877, Soddy became a chemist and eventually won a Nobel prize for work on radioactive decay. Then he turned his attention to economics.

Between 1921 and 1934, Soddy wrote four books that looked at how money relates to the physical economy. For his ground-breaking work, Soddy was rewarded with deafening silence. Here’s how ecological economist Eric Zencey puts it:

… Soddy carried on a quixotic campaign for a radical restructuring of global monetary relationships. He was roundly dismissed as a crank.

Although ignored during his life, Soddy’s work would become a central part of ecological economics. Let’s have a look at Soddy’s thinking.

Wealth vs. virtual wealth

Like a good natural scientist, Soddy insisted that human society is constrained by the laws of physics. Humans survive, he noted, by consuming natural resources. Exhaust these resources and we’re done for.

Think of humans (and our economy), says Soddy, like a machine. We transform energy into physical work. Like all machines, we’re bound by the laws of thermodynamics, which say that you can’t get something for nothing. Energy output requires energy input. That means humans are forever dependent on natural resources.

Now comes the problem. Our biophysical stock of resources — what Soddy called ‘wealth’ — is bound by the laws of thermodynamics. But money — which Soddy called ‘virtual wealth’ — is bound only by the laws of mathematics. Money can grow forever. Natural resource extraction cannot. This mismatch, Soddy claimed, is the root of most economic problems.

Cows and virtual cows

Here’s an example of Soddy’s thinking. Suppose that Alice is a would-be cattle farmer. She inherited some land and wants to use it to farm cattle. The problem is she has no money.

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