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Insurance is a form of risk management primarily used to hedge against the risk of a contingent, uncertain loss. Insurance is defined as the equitable transfer of the risk of a loss, from one entity to another, in exchange for payment. An insurer, or insurance carrier, is a company selling the insurance; the insured, or policyholder, is the person or entity buying the insurance policy. The amount to be charged for a certain amount of insurance coverage is called the premium. Risk management, the practice of appraising and controlling risk, has evolved as a discrete field of study and practice.

The transaction involves the insured assuming a guaranteed and known relatively small loss in the form of payment to the insurer in exchange for the insurer's promise to compensate (indemnify) the insured in the case of a financial (personal) loss. The insured receives a contract, called the insurance policy, which details the conditions and circumstances under which the insured will be financially compensated.
Contents

1 Principles
1.1 Insurability
1.2 Legal
1.3 Indemnification
2 Effects
3 Insurers' business model
3.1 Underwriting and investing
3.2 Claims
3.3 Marketing
4 History of insurance
5 Types of insurance
5.1 Auto insurance
5.1.1 Gap insurance
5.2 Health insurance
5.3 Accident, sickness and unemployment insurance
5.4 Casualty
5.5 Life
5.5.1 Burial insurance
5.6 Property
5.7 Liability
5.8 Credit
5.9 Other types
5.10 Insurance financing vehicles
5.11 Closed community self-insurance
6 Insurance companies
7 Across the world
7.1 Regulatory differences
8 Controversies
8.1 Insurance insulates too much
8.2 Complexity of insurance policy contracts
8.3 Limited consumer benefits
8.4 Redlining
8.5 Insurance patents
8.6 The insurance industry and rent-seeking
8.7 Religious concerns
9 See also
10 Notes
11 Bibliography
12 External links

Principles
Financial market
participants Assorted United States coins.jpg

Collective investment schemes
Credit unions
Insurance companies
Investment banks
Pension funds
Prime brokers
Trusts

Finance series

Financial market
Participants
Corporate finance
Personal finance
Public finance
Banks and banking
Financial regulation

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Insurance involves pooling funds from many insured entities (known as exposures) to pay for the losses that some may incur. The insured entities are therefore protected from risk for a fee, with the fee being dependent upon the frequency and severity of the event occurring. In order to be insurable, the risk insured against must meet certain characteristics in order to be an insurable risk. Insurance is a commercial enterprise and a major part of the financial services industry, but individual entities can also self-insure through saving money for possible future losses.[1]
Insurability
Main article: Insurability

Risk which can be insured by private companies typically share seven common characteristics:[2]

Large number of similar exposure units: Since insurance operates through pooling resources, the majority of insurance policies are provided for individual members of large classes, allowing insurers to benefit from the law of large numbers in which predicted losses are similar to the actual losses. Exceptions include Lloyd's of London, which is famous for insuring the life or health of actors, sports figures and other famous individuals. However, all exposures will have particular differences, which may lead to different premium rates.
Definite loss: The loss takes place at a known time, in a known place, and from a known cause. The classic example is death of an insured person 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.
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 or even purchasing a lottery ticket, are generally not considered insurable.
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 hardly any point in paying such costs unless the protection offered has real value to a buyer.
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 the insurance will be purchased, 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 US Financial Accounting Standards Board standard number 113)
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.
Limited risk of catastrophically large losses: Insurable losses are ideally independent and non-catastrophic, meaning that the losses do not happen all at once and individual losses are not severe enough to bankrupt the insurer; insurers may prefer to limit their exposure to a loss from a single event to some small portion of their capital base. Capital constrains insurers' ability to sell earthquake insurance as well as wind insurance in hurricane zones. In the US, flood risk is insured by the federal government. 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.

Legal

When a company insures an individual entity, there are basic legal requirements. Several commonly cited legal principles of insurance include:[3]

Indemnity – the insurance company indemnifies, or compensates, the insured in the case of certain losses only up to the insured's interest.
Insurable interest – the insured typically must directly suffer from the loss. Insurable interest must exist whether property insurance or insurance on a person is involved. The concept requires that the insured have a "stake" in the loss or damage to the life or property insured. What that "stake" is will be determined by the kind of insurance involved and the nature of the property ownership or relationship between the persons. The requirement of an insurable interest is what distinguishes insurance from gambling.
Utmost good faith – the insured and the insurer are bound by a good faith bond of honesty and fairness. Material facts must be disclosed.
Contribution – insurers which have similar obligations to the insured contribute in the indemnification, according to some method.
Subrogation – the insurance company acquires legal rights to pursue recoveries on behalf of the insured; for example, the insurer may sue those liable for insured's loss.
Causa proxima, or proximate cause – the cause of loss (the peril) must be covered under the insuring agreement of the policy, and the dominant cause must not be excluded
Mitigation - In case of any loss or casualty, the asset owner must attempt to keep loss to a minimum, as if the asset was not insured.

Indemnification
Main article: Indemnity

To "indemnify" means to make whole again, or to be reinstated to the position that one was in, to the extent possible, prior to the happening of a specified event or peril. Accordingly, life insurance is generally not considered to be indemnity insurance, but rather "contingent" insurance (i.e., a claim arises on the occurrence of a specified event). There are generally two types of insurance contracts that seek to indemnify an insured:

an "indemnity" policy, and
a "pay on behalf" or "on behalf of"[4] policy.

The difference is significant on paper, but rarely material in practice.

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