People seek security. A sense of security may be the next basic goal after food, clothing, and
shelter. An individual with economic security is fairly certain that he can satisfy his needs (food,
shelter, medical care, and so on) in the present and in the future. Economic risk (which we will
refer to simply as risk) is the possibility of losing economic security. Most economic risk derives
from variation from the expected outcome.
One measure of risk, used in this study note, is the standard deviation of the possible outcomes.
As an example, consider the cost of a car accident for two different cars, a Porsche and a Toyota.
In the event of an accident the expected value of repairs for both cars is 2500. However, the
standard deviation for the Porsche is 1000 and the standard deviation for the Toyota is 400. If the
cost of repairs is normally distributed, then the probability that the repairs will cost more than
3000 is 31% for the Porsche but only 11% for the Toyota.
Modern society provides many examples of risk. A homeowner faces a large potential for
variation associated with the possibility of economic loss caused by a house fire. A driver faces a
potential economic loss if his car is damaged. A larger possible economic risk exists with respect
to potential damages a driver might have to pay if he injures a third party in a car accident for
which he is responsible.
Historically, economic risk was managed through informal agreements within a defined
community. If someone’s barn burned down and a herd of milking cows was destroyed, the
community would pitch in to rebuild the barn and to provide the farmer with enough cows to
replenish the milking stock. This cooperative (pooling) concept became formalized in the
insurance industry. Under a formal insurance arrangement, each insurance policy purchaser
(policyholder) still implicitly pools his risk with all other policyholders. However, it is no longer
necessary for any individual policyholder to know or have any direct connection with any other
policyholder.
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