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.

Allstate: Allstate is the eighth-best insurance company, with many Allstate customers in our survey reporting that they didn’t feel like they were in good hands. Allstate customers were particularly unhappy with the value they felt they got from Allstate, with many of them saying they wouldn’t recommend Allstate and didn’t plan to renew their policies.
You can also save on car insurance by choosing the lowest amount of coverage you can get while still making sure that you’re meeting your state’s legal requirements for insurance and giving yourself the coverage you need if you’re in an accident. For example, let’s say you choose to get the legal minimum for liability coverage, which we’ll say is $30,000 for this example. If you are at fault for an accident that hurts someone, resulting in $100,000 in medical costs for them, you will be on the hook for the $70,000 difference between your insurance coverage and the harm you caused. You can be sued and lose assets, like your home or retirement savings, if this happens – so make sure you have enough insurance to keep your assets in the event of an accident where you are at fault.
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 United States, 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.
Methods for transferring or distributing risk were practiced by Chinese and Babylonian traders as long ago as the 3rd and 2nd millennia BC, respectively.[1] Chinese merchants travelling treacherous river rapids would redistribute their wares across many vessels to limit the loss due to any single vessel's capsizing. The Babylonians developed a system which was recorded in the famous Code of Hammurabi, c. 1750 BC, and practiced by early Mediterranean sailing merchants. If a merchant received a loan to fund his shipment, he would pay the lender an additional sum in exchange for the lender's guarantee to cancel the loan should the shipment be stolen, or lost at sea.
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