Archive for April 18th, 2010
How do car insurance companies calculate the premium rates?
The business of insurance is called underwriting. The company enters into a contract (called a policy) and agrees to indemnify a group of people like you against defined losses. So it uses some heavy duty math to work out the probability of the losses being incurred. It’s called risk assessment and relies on a complicated use of statistics. For vehicle insurance, the companies collect the details from every reported traffic accident in the US looking at the age, sex and occupation of the driver, the make and model being driven, the time of day, the road conditions, and the extent of the damage. The insurers share the information on the current costs of replacement parts and the labor to fit them.
They also manage to talk the health insurance companies into sharing their current costs on medical treatment for those injured in traffic accidents. With all this information, they can make good estimates of the cost of loss, i.e. the total amount they may have to pay out if they insure, say, 100,000 drivers. They take this estimate, add the cost of running the insurance company and a profit margin. This total is then divided between all the 100,000 as their premiums. Some companies divide the total equally so the good drivers subsidize the bad. But the majority adjusts the individual amounts based on the driver’s safety record. That way, each policy holder pays more or less depending on how well he or she drives. This is more fair. Read the rest of this entry »