[dan-robertson]

Insurance is a business that’s mostly designed for uncorrelated tail risks. It works well for insuring shipping. It works pretty well for insuring against house fires. It can be tricky with natural disasters where the risks are quite correlated, though insurance companies try to prepare for it.

It works poorly for cases where the risks are unknown at the time the insurance is sold and then turn out to be correlated. For example asbestos-related lung disease claims basically wiped out many syndicates at Lloyds (though this was exacerbated by other problems like the accounting practices or underwriters having unlimited personal liability)