Economic crashes aren't caused by bad policy—they are a physical inevitability of how we build supply chains.
April 16, 2026
Original Paper
Sandpile Economics: Theory, Identification, and Evidence
arXiv · 2604.13890
The Takeaway
We tend to blame central banks or greedy investors for market crashes, but this paper argues that crises are a built-in property of production networks. Using 'Sandpile Theory,' the authors show that specialized supply chains naturally drift toward a state of 'geometric fragility.' When a network becomes too efficient and specialized, it reaches a tipping point where a tiny, random shock can trigger a massive power-law cascade. This means that as our global economy becomes more 'optimized,' it also becomes physically more likely to collapse in spectacular ways. For regular people, this implies that stability is not the default state of the economy; rather, the system is constantly 'falling' toward the next unavoidable crash.
From the abstract
Why do capitalist economies recurrently generate crises whose severity is disproportionate to the size of the triggering shock? This paper proposes a structural answer grounded in the evolutionary geometry of production networks. As economies evolve through specialization, integration, and competitive selection, their inter-sectoral linkages drift toward configurations of increasing geometric fragility, eventually crossing a threshold beyond which small disturbances generate disproportionately l