Fundamental risk
A risk that strikes a large number of insureds simultaneously and cannot be diversified by pooling, as opposed to particular risk.
In insurance theory, a fundamental risk strikes a very large number of insureds at once and destroys entire classes of assets, as opposed to particular risk, which affects an isolated individual without touching others. An isolated fire is a particular risk, easily pooled; a war, a pandemic or a systemic crisis are fundamental risks. The difference is correlation. The law of large numbers steadies a portfolio's losses when claims are independent; when they all land together, adding insureds adds risk instead of spreading it. Correlated, catastrophic and impossible to diversify, fundamental risks in insurance are hard to cover by nature, and no premium can fund massive losses that arrive on the same day. Textbooks set a second pair beside it, pure versus speculative risk, which answers a different question (can you only lose, or also gain) and often gets mixed up with the first. War is the archetype of fundamental risk, which is why its exclusion is the oldest and most stable in insurance contracts. That is where the private market stops, and the burden often falls to a public backstop, such as Pool Re for terrorism in the United Kingdom. Systemic cyber now puts the same question to underwriters.
Textbook case in numbers: one million insured homes, each exposed to an independent fire with a 0.1% annual probability and a 200,000 euro cost. Expected losses are 1,000 claims, or 200 million euros, with a standard deviation of about 32 claims, 6.3 million: premium can fund that. Let a single event hit 30% of those homes and the bill becomes 300,000 claims, or 60 billion, all at once. A systemic cyberattack on a major payment system, which could cost several trillion dollars, has that second profile, the profile of a fundamental risk that private pooling cannot absorb.
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