Property and casualty insurance rests on a small set of legal and economic ideas that explain why an insurer is willing to pay tens of thousands of dollars on a claim in exchange for a few hundred dollars of premium. This chapter builds that foundation: what makes a risk insurable, the five ways a risk can be handled, the special features of an insurance contract, the timing rule for insurable interest in property (which is very different from life insurance), how the principle of indemnity controls every payout, and the clauses — subrogation, other-insurance, coinsurance, deductibles — that an adjuster actually applies at the loss site. These concepts are national and stable: they do not change from state to state, and every later chapter assumes them. Master this chapter and you have covered roughly 5% of the exam plus the vocabulary the other 95% is written in.
Risk, hazards, and what makes a risk insurable
Risk is uncertainty about whether a loss will occur. Insurers write only pure risk — the chance of loss or no loss, with no possibility of gain (a house may burn or may not burn). Speculative risk, which carries a chance of gain, is not insurable: you cannot buy a property policy on a horse race, a hand of poker, or a stock trade, because the insured could profit from the event.
A peril is the cause of a loss — fire, theft, windstorm, collision. A hazard is a condition that increases the chance or size of a loss, and hazards come in four families you must be able to name on sight:
- Physical hazard — a tangible condition: a frayed extension cord, an oily rag pile, a wood-shake roof in a brush zone.
- Moral hazard — dishonesty: an insured who plans to burn the building to collect, or who inflates a claim.
- Morale (attitudinal) hazard — carelessness that grows because the person is insured: leaving the car unlocked or the door open because "insurance will cover it." (Do not confuse morale with moral — moral is deliberate dishonesty; morale is indifference.)
- Legal hazard — a court or regulatory environment that increases the likelihood or size of a loss, such as a jurisdiction known for large jury awards.
To be commercially insurable, a pure risk should have the classic characteristics of an insurable risk: the loss must be due to chance (accidental, outside the insured's control); definite and measurable in time, place, and amount; predictable in the aggregate so an actuary can price it; large enough to cause hardship (you don't insure a $2 pen); part of a large number of similar exposure units; and not catastrophic to the insurer when many policies are pooled at once (which is why flood, war, and nuclear are handled specially).
Law of large numbers and adverse selection
An insurer can charge a fair premium only because of the law of large numbers: as the number of similar exposure units observed grows, actual loss experience converges on the predicted average. One frame house's chance of burning this year is nearly impossible to predict; the loss rate across a million similar frame houses is highly predictable. That is the entire engine of insurance pricing.
For the prediction to hold, the pool must be built of homogeneous exposure units — risks that share construction, occupancy, protection, and exposure characteristics. Drop a fireworks factory into a homeowners pool and the prediction breaks.
Adverse selection is the opposing force: people and businesses who know they have an above-average chance of loss seek insurance more aggressively than the general public. The landlord whose tenants just started a hazardous operation has a stronger reason to buy a fire policy than the average landlord. The carrier's defense against adverse selection is underwriting — inspections, prior-loss reports, replacement-cost estimators, and the right to decline, surcharge, or add conditions — plus proper rate classification so each risk pays a premium that reflects its own exposure.
Five ways to handle a risk
Insurance is only one of the tools, and the exam expects you to name all five on sight:
- Avoidance — eliminate the exposure entirely: skip the trampoline, don't launch the delivery service.
- Retention — keep the risk, either deliberately (a deductible, a self-insured fleet) or by simply failing to notice the exposure.
- Reduction (loss control) — make loss less likely or less severe: sprinklers, alarms, driver training, guarded machinery.
- Sharing — spread the risk across a group, as partners or pool members do.
- Transfer — shift the financial consequences to someone else by contract. Insurance is the dominant transfer mechanism; a hold-harmless agreement is the non-insurance form.
A deductible shows two techniques working together: the insured retains the small, predictable layer and transfers the large, uncertain one — which is exactly why raising the deductible lowers the premium.
The insurance contract and its four special features
A policy is first a contract, so it needs the four classic contract elements:
- Offer and acceptance (agreement) — usually the application is the offer and the insurer's issuance of the policy at the quoted terms is the acceptance. In the field, a producer with binding authority may issue a binder — temporary evidence that coverage is in force until the policy is issued or the application is declined. A binder can be oral or written, but it is a stopgap, not the contract itself.
- Consideration — the applicant's premium and the truthful statements in the application, exchanged for the insurer's promise to pay covered losses.
- Competent parties — of legal age and mental capacity, and the insurer must be authorized (admitted) to write that line in that state.
- Legal purpose — you cannot insure an illegal enterprise or property held to commit fraud.
Insurance contracts then carry four distinctive features the exam tests heavily:
- Aleatory — the dollars exchanged are unequal and depend on chance. The insured may pay $800 and collect $400,000, or pay $800 and collect nothing.
- Unilateral — only one party (the insurer) makes a legally enforceable promise once the premium is paid. The insured cannot be sued for "breach" for simply not renewing.
- Contract of adhesion — it is drafted entirely by the insurer and offered take-it-or-leave-it. Because the insured cannot negotiate the wording, ambiguities are construed against the insurer (the drafter).
- Conditional — the insurer's duty to pay is triggered only when the insured satisfies the policy conditions: pay premium, give prompt notice of loss, file proof of loss, protect the property, and cooperate.
Two more descriptors round out the list: insurance is a personal contract (it insures a person's interest, not the object, so it generally cannot be assigned to a new owner without the insurer's consent), and it is a contract of utmost good faith (below).
Utmost good faith: representations, warranties, and concealment
Insurance is a contract of utmost good faith (uberrimae fidei): each party may rely on the other's truthful disclosures, because only the applicant truly knows the condition of the property and the history of past losses. Three doctrines put teeth in that duty:
- Representation — a statement believed true when made, in or based on the application. It must be true in all material respects; a material misrepresentation (one that would have changed the underwriting decision) lets the insurer rescind the policy.
- Warranty — a stricter promise written into the policy itself (for example, a protective-safeguards warranty that a sprinkler system will be maintained). Breach of a warranty can void coverage even if the breach did not cause the loss.
- Concealment — the silent failure to disclose a material fact the applicant knows and the insurer does not (a recent decline by another carrier, a prior arson conviction). Concealment of a material fact generally lets the injured party rescind.
Fraud — an intentional misstatement made to obtain coverage or payment — is grounds for rescission and may be referred for criminal prosecution.
Two forgiving doctrines run the other direction. Waiver is the voluntary giving up of a known right (an insurer that accepts a late premium waives the right to deny for lateness). Estoppel bars a party from asserting a right when the other party reasonably relied on its earlier conduct to their detriment. Together they explain why an insurer's conduct can create coverage its policy language would not.
Insurable interest in property — the time-of-loss rule
Insurable interest is the financial stake a person must have in the subject of insurance for the policy to be legally enforceable. Without it, the contract is a wager and void as against public policy.
The property-insurance rule is a favorite exam trap because it is the opposite of the life-insurance rule:
- Life insurance — insurable interest must exist only at the time the policy is issued (inception).
- Property & casualty insurance — insurable interest must exist at the time of the loss. It is not enough that the insured owned the property when the policy was bought.
The classic fact pattern: a homeowner sells the house but forgets to cancel the policy; the house then burns. The seller has no insurable interest at the time of loss and collects nothing, and the policy does not automatically transfer to the buyer without the insurer's consent.
Common sources of insurable interest in property: ownership, a secured (lien/mortgage) interest, a leasehold interest, a bailee's responsibility for customers' goods, and a contractual duty to insure. A party can recover no more than the value of its own interest, even if the policy limit is higher.
Indemnity, subrogation, and valuation (ACV vs. replacement cost)
The principle of indemnity is the dominant idea in property insurance: the insured should be restored to the same financial position they were in just before the loss — no better and no worse. Insurance is not a source of profit. Several devices enforce indemnity: insurable interest, actual-cash-value settlement, other-insurance clauses, subrogation, and salvage.
Two valuation methods dominate P&C policies:
- Actual Cash Value (ACV) — the most common measure. The usual definition is replacement cost at the time of loss, minus depreciation for age, wear, and obsolescence. A 15-year-old roof is paid at a fraction of a new roof. (Some jurisdictions instead use the "broad evidence rule" or a fair-market measure — the concept is national, the exact statutory definition can vary.)
- Replacement Cost (RC) — pays the cost to repair or replace with new property of like kind and quality, with no deduction for depreciation, usually subject to a coinsurance requirement and a depreciation holdback that is released only after the insured actually repairs or rebuilds.
Subrogation is indemnity's partner. After the insurer pays the insured, it steps into the insured's legal shoes and may pursue the negligent third party who caused the loss, up to the amount it paid. Subrogation prevents the insured from collecting twice (once from the insurer, once from the wrongdoer) and shifts the cost back to the party at fault. The insured must not impair the insurer's subrogation right — for example, by signing a release with the at-fault party before reporting the claim.
Salvage is the insurer's right to take the damaged property after paying an agreed loss, then recover value by repairing and reselling it.
Other insurance, coinsurance, and the insurance-to-value idea
When more than one policy covers the same property loss, indemnity still applies — the insured cannot collect the full loss from each. Other-insurance clauses decide how carriers share:
- Pro-rata — each insurer pays the proportion its limit bears to the total insurance in force. A $300,000 limit and a $700,000 limit on the same building pay 30% and 70% of a covered loss. (Common in property.)
- Contribution by equal shares — each carrier pays equal dollar amounts until the smallest limit is exhausted; the larger-limit policy then continues alone. (Common in liability.)
- Excess — one policy is primary and the other pays only after the primary limit is exhausted. (Common in umbrella and auto.)
Payment = (Insurance Carried ÷ Insurance Required) × Loss − Deductible
The clause is an insurance-to-value incentive: carry adequate limits and pay a fair premium, or share the partial loss. The penalty does not apply to a total loss — a total loss is paid up to the policy limit.