insurance company
It must be equal with the total sum of the insurance that the total sum and the insurance company of the premium that an insurance company collected from the group of policyholders with the same risk pay in the group. This is called the principles such as income and expenditure aspects, and it is requested so that the insurance becomes stable continuously, and it is administered. The principles such as income and expenditure aspects expanded the principle of payment / the counter-presentation equality for time space, and the latter is a sufficient condition of the former, but it is not a necessary condition. In addition, the principles such as income and expenditure aspects show that it is the structure which processes an uncertain risk reasonably because people having the same risk gather a lot to be able to understand it because I am assuming there being a policyholder with the same risk as a group.