Auto Insurance Claims: Should the premium have change after the market value of the vehicle is down?, medical costs, insurance companies

Question
I have noticed the premium of the car insurance usually has no change after year by year unless you had claims before. Since the quote for an old car is usually lower then an identical new car, why should the premium has no change after the market value of the vehicle is down? Should people request to lower the premium because of the change of the market value of the vehicle before the policy is renewed? Can you explain it?  

Answer
There are a lot of factors that go into determining premium for a policy.  Insurance companies change their overall rates for everyone frequently, sometimes 1-2 times per year, depending on the environment.  They look at market trends for frequency of claims and how much they pay on average for all claims.  Medical costs and parts cost tend to rise every year with inflation.

Then they look at your policy individually.  They look at your age, your tickets, time with the company, accidents, and other factors.  All can cause a change.

The age of your car does not impact the cost to defend you if you damage someone else's property.  It may become more or less expensive to repair your vehicle depending on  availablility of parts for that model.   It is true that the market value drops and if it were totalled they would pay less, but this is only one of many different factors that go into the premium.