Joseph Tainter - Diminishing Returns

Diminishing Returns

Tainter begins by categorizing and examining the often inconsistent explanations that have been offered for collapse in the literature. In Tainter's view, while invasions, crop failures, disease or environmental degradation may be the apparent causes of societal collapse, the ultimate cause is an economic one, inherent in the structure of society rather than in external shocks which may batter them: diminishing returns on investments in social complexity.

For contrast, Jared Diamond's 2005 book, Collapse: How Societies Choose to Fail or Succeed, focuses on environmental mismanagement as a cause of collapse. Finally, Tainter musters modern statistics to show that marginal returns on investments in energy, education and technological innovation are diminishing today. The globalised modern world is subject to many of the same stresses that brought older societies to ruin.

However, Tainter is not entirely apocalyptic: "When some new input to an economic system is brought on line, whether a technical innovation or an energy subsidy, it will often have the potential at least temporarily to raise marginal productivity" (p. 124). Thus, barring continual conquest of your neighbors (which is always subject to diminishing returns), innovation that increases productivity is – in the long run – the only way out of the dismal science dilemma of declining marginal returns on added investments in complexity.

And, in his final chapters, Tainter discusses why modern societies may not be able to choose to collapse: because surrounding them are other complex societies which will in some way absorb a collapsed region or prevent a general collapse; the Mayan and Chaocan regions had no powerful complex neighbors and so could collapse for centuries or millennia, as could the Western Roman Empire - but the Eastern Roman Empire, bordered as it was by the Parthian/Sassanid Empire, did not have the option of devolving into simpler smaller entities.

His paper Complexity, Problem Solving, and Sustainable Societies (1996) focuses on the energy cost of problem solving, and the energy-complexity relation in manmade systems.