Risk Pool

The group of similar exposures whose losses are shared through common premiums.

Overview

Each member pays a premium reflecting average expected loss plus loadings, and the unlucky few who suffer claims draw from the common fund. The law of large numbers makes average losses predictable as pools grow, which is why insurers obsess over volume, homogeneity, and independence of risks, and why catastrophe losses, correlated across a region at once, strain the logic and drive reinsurance. Pools can be public or private: assigned risk pools for otherwise uninsurable drivers, beach and windstorm pools in coastal states, terrorism backstops, and the high risk pools that preceded marketplaces. Bigger pools damp variance but do not reduce expected loss: pooling redistributes risk, it does not shrink it, which is what prevention and mitigation are for.