AlanT
Interesting comments. However I understand agreed value as just that and not related to market value. I stand to be corrected but an agreed value policy does not fluctuate with the market. In the past year bot prices have gone up due to demand and therefore market value policies would pay more on the same boat this year.
You are correct that market value fluctuates and that the Agreed Value on a policy does not.
However taking your hypothesis on prices going up during the policy period:
If you insure your boat on an Actual Value policy for, say $100k and that vessel becomes worth $125k at the time of the loss here is what would happen:
If the claim is a total loss you will receive the amount you declared on the policy ie $100k. You will not receive $125k.
If the claim is a partial loss of say $25k the Loss Adjuster will determine that the market value is $125k and will then look at the coinsurance clause to determine whether to reduce your claim for underinsurance. If the coinsurance clause allows 80% then the calculation is $125k X 80% = $100k. Since you have insured for $100k you have satisfied the coinsurance provision and your claim of $25k will be paid in full less the deductible.
However if in the partial loss scenario above the Coinsurance clause does not have an (80% or other percentage) allowance then the claim calculation will look like this:
Market value $125k. Insured Value $100k Underinsurance 20%. Any claim that is not a total loss is reduced by this 20%. Partial loss claim of $25k less 20% is $20k. Claim will be paid for $20k less the deductible.
Final example with an 80% coinsurance clause: Insured Value $100k but Market value at time of loss is $150k. Partial loss incurred is $50k.
Calculation: Insured is required to insure to 80% of Market value to avoid coinsurance. Market Value $150k Times 80% = $120k. However vessel is only insured for $100k. Vessel is underinsured therefore by 16.67% (100/120*100-100). Claim of $50k is reduced to $41.7k before application of the deductible.
In conclusion there is no circumstance under either an Agreed Value, or an Actual Value policy where you will receive more for a Total Loss than the amount stated on the policy. Regardless of whether Market value is higher.
In an Agreed Value policy you will always receive the amount on the policy for Total Loss, whereas on an Actual Value policy that is the most you can receive and if Market value proves to be higher than the amount on the policy you may suffer a reduction in your claim as calculated above.
It is for this reason that Agreed Value policies are highly preferred. You know what you are going to get, and you do not have to engage in expensive litigation or more likely arbitration since there is nothing to contest.
Ultimately insurers want values to be set fairly. If Insured values are too high, insurer has a fear of moral hazard making claims more likely especially in hard times. If insured values are too low, Insurer does not get sufficient premium for partial loss exposure. (Bear in mind that the portion of the premium that you pay that is allocated to Physical Damage (as opposed to liability) is rated against the insured value. So the lower the value the lower the premium).
Coinsurance allows Insurers to 'regulate' by creating a penalty for underinsurance. The reason for the 80% (ie 20% waffle room) is to not unfairly penalize a conscientious insured that sets a fair value at policy inception, but then experiences an increase in market value during the period of the policy.
Hope this is helpful. I do apologize for its length! (as the bishop said to the actress).