Louis Brandeis, Penn Mutual Life Insurance Company v…
“ In a mutual company, whatever the field of its operation, the premium exacted is necessarily greater than the expected cost of the insurance, as the redundancy in the premium furnishes the guaranty fund out of which extraordinary losses may be met, while in a stock company they may be met from the capital stock subscribed. It is of the essence of mutual insurance that the excess in the premium over the actual cost as later ascertained shall be returned to the policy holder. Some payment to the policy holder representing such excess is ordinarily made by every mutual company every year ”
