Moral Hazard

Moral hazard is the tendency for a party protected from the consequences of a risk to behave differently than they would if they bore those consequences themselves. The National Association of Insurance Commissioners, the standard-setting body for state insurance regulators, defines it in its glossary as "personality characteristics that increase probability of losses. For example, not taking proper care to protect insured property because the insured knows the insurance company will replace it if it is damaged or stolen." That definition locates the hazard in the person. Economists use the same phrase for the effect of the contract rather than a trait of the buyer: once a cost is borne by someone else, the decision to incur it changes, and that shift happens in ordinary people who are not careless at all. Both usages are established, and a reader will meet both.

Insurance regulators also maintain a separate and easily confused headword. Morale hazard is defined as "negligence or disregard on the part of the insured which could lead to probable loss." The distinction the two terms draw in the trade is between the insured who is disposed toward loss and the insured who is simply indifferent to preventing it. Outside the insurance trade the second word is rarely used, and general writing tends to fold both into "moral hazard."

The economics version is worth stating carefully, because it carries no accusation. If a service costs a household $40 out of a $400 bill, the household is deciding whether the service is worth $40. That is a rational response to the price they face, and it explains most of what the concept predicts without anyone behaving badly. The insurance-trade version, by contrast, points at the policyholder who leaves the shed unlocked because the contents are covered. Both describe real behavior, and confusing them makes the concept sound like a judgment about character when most of what it measures is a response to a price.

The design responses all work the same way: put some of the cost back. A deductible leaves the first slice of every loss with the insured. Coinsurance keeps them exposed to a percentage of what follows. A copayment attaches a fixed, visible price to each use. A coverage cap limits how far the insurer's exposure runs. Experience rating, which regulators describe as rating a group on the basis of its own expected claims with retrospective adjustment for past periods, reconnects tomorrow's premium to yesterday's losses, so the group keeps a financial interest in preventing them. On the property side the same logic appears as premium credits for a monitored alarm, an anchored water heater or a new roof, and as exclusions for damage the insured could have prevented by maintenance.

The trade-off is symmetric and there is no setting that avoids it. Cost sharing that deters an unnecessary emergency-room visit also deters a necessary one, because the person deciding is the same person and the price signal does not distinguish between them. Raising a deductible reduces claim frequency partly by reducing wasteful claims and partly by suppressing claims the policy exists to pay. That is why the out-of-pocket maximum exists in health coverage: it accepts the loss of the price signal above a threshold in exchange for capping the household's exposure. The design question is never whether to eliminate moral hazard but how much of it to buy off, and at whose cost.

Outside insurance the concept describes the same structure in finance. A decision-maker who captures the upside of a risk while someone else absorbs the downside will take more of it. That shape appears in an executive paid on short-run results, in a lender who sells the loan before the borrower's first payment, and in the argument that guarantees behind a financial institution encourage it to run thinner margins than it otherwise would. Financial regulation's responses mirror insurance's: retained risk, capital requirements, deferred compensation and clawbacks are all ways of leaving the decision-maker holding part of the downside.

A caution about how the term gets used in argument. "Moral hazard" is frequently deployed to oppose a protection rather than to describe an effect, and the two are different claims. That a benefit changes behavior at the margin is usually easy to establish; that the change outweighs the benefit is a separate empirical question, and the phrase does not answer it.

Cost sharing works by leaving the insured exposed to enough of the bill that the decision to incur it remains a real decision. The size of the exposure is the design lever, and every policy makes that choice explicitly.

A hypothetical, to show what the lever does. Compare two health plans facing the same $5,000 elective procedure. The first has a $2,000 annual deductible and 20% coinsurance thereafter, with a $6,000 out-of-pocket maximum. The patient pays the $2,000 deductible, then 20% of the remaining $3,000, which is $600, for a total of $2,600; the plan pays $2,400. The second plan covers the procedure in full from the first dollar. Its patient pays nothing, and faces no financial reason to weigh the procedure's value against its cost. The figures are invented for the illustration.

Now read the same arithmetic from the other side, which is the part that makes this genuinely hard. The first plan's patient is deterred from the procedure by $2,600 whether the procedure is worth having or not. If it is discretionary, the plan has done its job. If it is the diagnostic that would have caught something early, the plan has just imposed a cost far larger than $2,600 on the patient and, eventually, on itself. Cost sharing is a blunt instrument that cannot see which case it is in, which is why plans exempt preventive care from it and why the out-of-pocket maximum exists.

On the property side the same lever is a straight trade of premium against exposure. Raising a deductible from $1,000 to $2,500 lowers the premium every year and costs $1,500 more in the years a claim happens, and it also changes behavior: the household stops filing small claims, which is part of what the insurer is buying.

What cost sharing gets right

• It restores a price signal to a decision the insured would otherwise make for free, which is the only reason a low deductible costs more than a high one.
• Small claims are expensive to administer relative to their size, and a deductible removes most of them.
• Experience rating keeps an employer or a fleet operator financially interested in preventing losses rather than only in insuring them.
• Premium credits for prevention pay for the behavior directly rather than penalizing its absence after a loss.

What it gets wrong, unavoidably

• The same price signal deters necessary spending and unnecessary spending alike, because the person deciding cannot always tell which is which.
• Cost sharing falls hardest on households with the least ability to absorb it, so the deterrent effect is strongest where the consequences of under-using care are worst.
• Measuring the effect is difficult, and "moral hazard" is often asserted in debate as though the size of the effect were established.
• Some of what the concept predicts requires no bad behavior at all, so framing it as a character problem misdescribes most of it.