Although it is common place to have more than one policy insuring a risk, Double Indemnity is Illegal. So long as a claim is not filed for the same loss and Double Indemnity does not occur then there is no problem.
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Yes, though they'll both only cover 50%.
No, one car cannot be insured by two companies simultaneously.
Yes
The price of a single item will vary depending on the item, and half the value of two items. The amount of the item will be one because it is a single item. If there are two single items the amount will be doubled and will be worth twice the amount of a single item. In most cases if not all, a single item is worth about one third of the price of three items even if you buy one and get one free. If you get two for the price of one the single item amount will be two but the price will be one.
Two cars can be insured under one policy by adding both vehicles to the same insurance policy. This allows the policyholder to have coverage for both cars with a single premium and set of terms and conditions.
No, a vehicle cannot be insured by two different companies simultaneously.
Yes, you can purchase as many policies as you want.
You can be the named insured on a policy for any real property you own. In fact, only the owner can be the "named insured".
One to avoid smaller claims preferred by the insured - two treated as a copayment since the insured who prefers the claim should share a meagre portion of the liability.
Yes; in fact, it is quite common. One scenario in which it frequently happens is that of subrogation. When an insurer pays for the repair of its insured's vehicle, it acquires the right of action of the insured to recover that which it paid. If the other driver was insured, and if the two insurers have agreed (in advance) to arbitrate their subrogation disputes, arbitration is the only dispute resolution mechanism that may be used.
Power and money are two obvious ones. You may also say land was another item countries competed for.