What is 'natural aggregation' and 'workers' comp'?
Insurance companies have long tried to avoid natural aggregation, such as limiting homes insured on a shoreline.
Now, Buffett asserted, companies need to think about manmade aggregation risks.
As an example, while most folks think of the World Trade Center disaster as primarily a property/casualty loss, Buffett noted it will easily go down as the largest workers’ comp loss in history.