Commercially
insurable risks typically share seven
common characteristics.
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A large number of
homogeneous exposure units
. The vast majority of
insurance policies are provided for individual members of very
large classes. Automobile
insurance, for
example, covered about 175 million automobiles in the United States
in 2004. The existence of a large number of homogeneous exposure
units allows insurers to benefit from the so-called “law of large
numbers,” which in effect states that as the number of exposure
units increases, the actual results are increasingly likely to
become close to expected results. There are exceptions to this
criterion. Lloyd's of London is famous for insuring the life or
health of actors, actresses and sports figures. Satellite Launch
insurance covers events that are infrequent. Large commercial
property policies may insure exceptional properties for which there
are no ‘homogeneous’ exposure units. Despite failing on this
criterion, many exposures like these are generally considered to be
insurable.
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Definite
Loss
. The event that gives rise
to the loss that is subject to insurance should, at least in
principle, take place at a known time, in a known
place, and from a
known cause. The classic example is death of an insured on a life
insurance policy. Fire, automobile accidents, and worker injuries
may all easily meet this criterion. Other types of losses may only
be definite in theory. Occupational disease, for instance, may
involve prolonged exposure to injurious conditions where no
specific time, place or cause is identifiable. Ideally, the time,
place and cause of a loss should be clear enough that a reasonable
person, with sufficient information, could objectively verify all
three elements.
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Accidental
Loss
. The event that constitutes
the trigger of a claim should be fortuitous, or at least outside
the control of the beneficiary of the insurance. The loss should be
‘pure,’ in the sense that it results from an event for which there
is only the opportunity for cost. Events that contain speculative
elements, such as ordinary business risks, are generally not
considered insurable.
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Large
Loss
. The size of the loss must
be meaningful from the perspective of the insured. Insurance
premiums need to cover both the expected cost of losses, plus the
cost of issuing and administering the policy, adjusting losses, and
supplying the capital needed to reasonably assure that the insurer
will be able to pay claims. For small losses these latter costs may
be several times the size of the expected cost of losses. There is
little point in paying such costs unless the protection offered has
real value to a buyer.
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Affordable
Premium
. If the likelihood of an
insured event is so high, or the cost of the event so large, that
the resulting premium is large relative to the amount of protection
offered, it is not likely that anyone will buy insurance, even if
on offer. Further, as the accounting profession formally recognizes
in financial accounting standards, the premium cannot be so large
that there is not a reasonable chance of a significant loss to the
insurer. If there is no such chance of loss, the transaction may
have the form of insurance, but not the substance. (See the U.S.
Financial Accounting Standards Board standard number
113)
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Calculable
Loss
. There are two elements
that must be at least estimable, if not formally calculable: the
probability of loss, and the attendant cost. Probability of loss is
generally an empirical exercise, while cost has more to do with the
ability of a reasonable person in possession of a copy of the
insurance policy and a proof of loss associated with a claim
presented under that policy to make a reasonably definite and
objective evaluation of the amount of the loss recoverable as a
result of the claim.
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Limited risk of
catastrophically large losses
. The essential risk is
often aggregation. If the same event can cause losses to numerous
policyholders of the same insurer, the ability of that insurer to
issue policies becomes constrained, not by factors surrounding the
individual characteristics of a given policyholder, but by the
factors surrounding the sum of all policyholders so exposed.
Typically, insurers prefer to limit their exposure to a loss from a
single event to some small portion of their capital base, on the
order of 5 percent. Where the loss can be aggregated, or an
individual policy could produce exceptionally large claims, the
capital constraint will restrict an insurers appetite for
additional policyholders. The classic example is earthquake
insurance, where the ability of an underwriter to issue a new
policy depends on the number and size of the policies that it has
already underwritten. Wind insurance in hurricane zones,
particularly along coast lines, is another example of this
phenomenon. In extreme cases, the aggregation can affect the entire
industry, since the combined capital of insurers and reinsurers can
be small compared to the needs of potential policyholders in areas
exposed to aggregation risk. In commercial fire insurance it is
possible to find single properties whose total exposed value is
well in excess of any individual insurer’s capital constraint. Such
properties are generally shared among several insurers, or are
insured by a single insurer who syndicates the risk into the
reinsurance market
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