Educational information, not individual financial advice.
Key Takeaways
Insurance is a transfer of risk. You pay a small, known premium to an insurance company. In exchange, the company agrees to pay if a specific covered event happens — often a large, uncertain loss you couldn't afford on your own.
The economics work because the insurance company pools many people together. Most people in any given year don't have a claim. The premiums from the many pay for the claims of the few, plus the company's costs and profit.
Every insurance policy has four core numbers:
Premium. What you pay. Usually monthly or annually.
Deductible. What you pay first, before coverage kicks in. A $500 deductible auto policy means you pay the first $500 of a covered loss; the insurer pays the rest.
Coinsurance / copay. What you share with the insurer after the deductible. A policy with "80/20 coinsurance" means the insurer pays 80% of covered costs and you pay 20% until the out-of-pocket maximum.
Coverage limit. The maximum the insurer will pay. A $500,000 auto liability policy won't pay a nickel beyond $500,000 if you're found liable for a $2 million judgment.
Higher deductibles lower premiums because you absorb more small-claim risk. Higher coverage limits raise premiums because the insurer accepts more catastrophic risk. The tradeoffs are personal.
Insurance is for losses you can't afford to self-insure. It's not for minor expenses you could cover with savings.
Good candidates for insurance:
Bad candidates for insurance:
The test: would this loss financially devastate you if it happened? If yes, insure. If no, self-insure.
Insurance companies must figure out who's more likely to have a claim — and charge accordingly. If they charged everyone the same, only the high-risk people would buy the insurance. This is "adverse selection."
Mechanisms to counter:
A simple model: premiums − claims − expenses = profit.
Underwriting. Charge premiums that exceed expected claims. Insurers use actuarial data to estimate losses and price accordingly.
Investment income. Premiums are collected upfront; claims are paid later. The "float" can be invested in the meantime, often producing substantial income for the insurer.
Scale. Administrative costs spread across millions of policies.
Not every line of insurance is profitable every year. Commercial property coverage in hurricane-prone areas, for instance, can have catastrophic years. Insurers manage this through reinsurance (insurance for insurers) and diverse product portfolios.
Sooner is usually better. Life and disability insurance are dramatically cheaper for young, healthy people. Waiting until 50 to buy life insurance can triple the premium compared to age 30.
Buy when you have dependents. Life insurance's purpose is protecting dependents. If no one depends on your income, you probably don't need much life insurance.
Buy when you have significant assets. More wealth means more to lose to liability claims. Umbrella policies become valuable above certain asset levels.
Buy when risks materialize. If you switch from an indoor job to a motorcycle-riding outdoor job, your risk profile changes.
Every year, check whether your coverage still matches your life:
Horizons models insurance premiums as ongoing expenses, which properly reduces your available savings and spending capacity. Life insurance death benefits can be modeled as future contingent income that funds specific goals (paying off mortgage, covering children's education, replacing lost income).
Insurance delivers the most value for which kind of loss?
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