1.1 Insurance Principles & Risk
Key Takeaways
- Insurance handles only pure risk (chance of loss or no loss), never speculative risk, which carries a chance of gain.
- The law of large numbers lets insurers predict aggregate losses accurately as the number of similar exposure units grows.
- A hazard increases the chance or severity of a loss; the three types are physical, moral, and morale hazards.
- The five risk-management techniques are avoidance, retention, reduction (control), transfer, and sharing.
- Insurers manage assumed risk chiefly through underwriting (selection) and reinsurance (spreading large exposures).
Risk: Pure vs. Speculative
Risk is uncertainty regarding loss. Insurance deals with only one kind of risk. Pure risk involves only two possible outcomes — a loss or no loss — with no possibility of gain. Your house either burns or it does not; you either crash your car or you do not. Because pure risk produces no upside, it is the only risk insurers will accept.
Speculative risk involves three outcomes: loss, no change, or gain. Betting at a casino, trading stocks, or launching a business are speculative. Insurers refuse speculative risk because the insured could profit, which would violate the principle of indemnity and invite manipulation.
Risk is also described by its source. A peril is the actual cause of a loss — fire, windstorm, theft, collision. A hazard is a condition that increases the chance or severity that a peril will occur. Confusing peril and hazard is a classic exam trap: lightning is a peril; oily rags stored near a furnace are a hazard.
Hazards: Physical, Moral, and Morale
The three hazard types are tested repeatedly:
| Hazard | Definition | Example |
|---|---|---|
| Physical | A tangible condition of the property or person that increases loss potential | Icy sidewalk, frayed wiring, smoking, a person's medical history |
| Moral | Dishonesty or character flaws that lead a person to cause or fake a loss for gain | Arson for insurance money; filing a false claim |
| Morale | A careless or indifferent attitude because insurance exists | Leaving keys in an unlocked car; not bothering to lock the shop |
The shortcut: moral = dishonest intent; morale = carelessness/indifference. A single physical condition can attract both — a vacant building is a physical hazard (no one to spot a fire) and may invite a moral hazard (arson). Underwriters price for all three because each raises expected losses.
Elements of an Insurable Risk
Not every pure risk can be insured. An ideally insurable risk meets these elements (often abbreviated CANHAM/DICE on exams):
- Due to chance — accidental and outside the insured's control.
- Definite and measurable — the loss must have a determinable time, place, cause, and dollar amount.
- Predictable — average frequency and severity must be estimable so a fair premium can be set.
- Not catastrophic — the insurer cannot face simultaneous ruinous losses across the whole pool (flood, war).
- Large number of similar exposure units — needed for the law of large numbers to work.
- Randomly selected and spread — to combat adverse selection.
- Premium economically feasible — affordable relative to the potential loss.
The Law of Large Numbers and Indemnity
The law of large numbers is the mathematical backbone of insurance: the larger the number of similar, independent exposure units observed, the more closely actual results approach the predicted probability. With enough homes, autos, or lives in the pool, an insurer cannot predict which policyholder will suffer a loss but can predict the total losses of the group with great accuracy. This lets actuaries set premiums that are adequate (cover losses and expenses), not excessive, and not unfairly discriminatory.
The principle of indemnity restores the insured to the same financial condition that existed before the loss — no better, no worse. It prevents profiting from insurance and underlies tools such as actual cash value, policy limits, deductibles, and subrogation. Insurable interest — a financial stake such that the insured would suffer a genuine loss — must exist to make the contract valid and to support indemnity. In property insurance, insurable interest must exist at the time of loss; in life insurance, only at policy inception. Without insurable interest the contract is treated as a wager and is void as against public policy.
Three closely related principles round out the indemnity family. Subrogation lets the insurer recover from a negligent third party after paying, so the insured cannot also keep a recovery and profit. The collateral source rule and limits such as actual cash value (replacement cost minus depreciation) likewise cap recovery at the true loss. Each exists to keep insurance a mechanism for restoration, never gain.
Adverse Selection, Risk Management, and How Insurers Respond
Adverse selection is the tendency of those with the greatest probability of loss to seek insurance most eagerly. If unchecked, the pool fills with bad risks and premiums become inadequate. Insurers fight adverse selection through underwriting standards, exclusions, waiting periods, and rate classifications.
Individuals and businesses handle risk through five risk-management techniques — remember "STARR" or avoid/retain/reduce/transfer/share:
- Avoidance — eliminate the exposure entirely (don't open the hazardous plant).
- Retention — knowingly keep the risk (a deductible, self-insurance).
- Reduction (control) — lower frequency/severity (sprinklers, training).
- Transfer — shift the risk to another party; insurance is the most common transfer mechanism.
- Sharing — distribute risk among a group (a reciprocal, a pool).
The insurer, having accepted transferred risk, manages it two main ways. Underwriting is the selection and classification process — deciding which applicants to accept, at what rate, and on what terms — keeping the pool balanced. Reinsurance is insurance for insurers: a primary carrier (the ceding company) transfers part of its exposure to a reinsurer, which stabilizes results and protects against catastrophic accumulations. Together, underwriting and reinsurance let insurers honor the law of large numbers while surviving shock losses.
An applicant leaves his store unlocked overnight because he reasons that his insurance will cover any theft. This attitude is an example of which type of hazard?
Which characteristic distinguishes a pure risk from a speculative risk?
An insurer transfers part of its exposure on a large commercial property to another carrier to protect against a catastrophic accumulation. This practice is called:
The principle that lets actuaries predict aggregate losses with increasing accuracy as the number of similar exposure units grows is the: