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Anatomy of an Economic Crisis: The Bushfire Analogy
ECON002 Lesson 17
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The Bushfire Analogy is a powerful framework for understanding the "small-causes-with-big-consequences" process of the 2008 Global Financial Crisis. In healthy periods, such as the Golden Age (1948–1979), the economy possesses miraculous homeostatic properties (negative feedbacks) that self-correct minor shocks. However, when the system's "dry undergrowth" becomes too dense, these mechanisms are overwhelmed by positive feedback mechanisms (vicious circles).

Environmental (FFDI) • Fuel Load (Dry Wood) • High Temp / Low Humidity • High Wind Speed Economic Crisis Index • Household Debt-to-Income • Low Housing Collateral • Bank Interconnectedness Analogy Map

The Raw Material of Collapse

The preceding "Great Moderation" led to a failure to learn from history. Just as a forest without small fires accumulates dangerous fuel, the stability of the 1990s encouraged a massive accumulation in the household debt-to-income ratio. When house prices began to slip in 2007 (represented as $P_{2007} = 92$), the "dry undergrowth" was primed. This spark ignited a financial accelerator: falling prices reduced housing collateral, leading to a credit crunch and a collapse in bank solvency.

Historical Mirror
A direct comparison between the first 10 months of the Great Depression and the 2008 financial crisis shows that the collapse of industrial production in the world economy was similar. Both events were characterized by bank runs and a global impact where the Baltic Dry Index plummeted, signaling a freeze in international trade.