Every answer and its explanation appears here once you have finished the path. Each one then links to the matching glossary entry, where the concept is set out in full with its worked example.
1. An insurer takes in a hundred million of premium and will not pay the matching claims for several years. Its combined ratio is 95 percent. What does that figure mean for the money it holds meanwhile?
It is being paid to hold money it invests, the cost of float being negative
Float is the cash built from premiums already collected and not yet paid out as claims, which the insurer holds and invests in the meantime. Because premium comes before loss, sometimes by years in long-tail lines, it permanently holds money that is not really its own, being earmarked for future claims, yet which it puts to work meanwhile. The decisive reasoning is about what that float costs. A combined ratio above one hundred means the underwriting itself loses money: the float is then a loan, and its cost is the excess over one hundred. A ratio below one hundred flips the sign: the insurer is already making money on underwriting, and investment return comes on top. At ninety-five, it is therefore being paid to hold money it invests, a position no other sector offers and which Warren Buffett popularized by describing it as borrowing at a negative cost.
Glossary entry →2. Since 2023, IFRS 17 has replaced the transitional standard IFRS 4. What can an insurer no longer do at the moment it writes a long, profitable contract?
Recognize the whole expected margin straight away
IFRS 17 is the international accounting standard for insurance contracts, effective in 2023 in place of IFRS 4, which was only a transitional regime tolerating inherited national practice. It requires the liability to be measured in three components: the present value of future cash flows, a risk adjustment, and a contractual service margin representing profit not yet earned. The other three answers therefore describe what the standard requires, not what it forbids. What it forbids lies elsewhere, and it is the substantive change: the expected profit on a profitable contract is no longer recognized at inception, it is stored and then released over the period the service is provided. The aim is comparability between insurers, long prevented by heterogeneous national conventions; the side effect is that a fast-growing insurer now shows less immediate profit than before, with nothing having changed in its real economics.
Glossary entry →3. An insurer revises upward the future claims expected on a group of contracts. Its contractual service margin stays positive after the revision. What is the effect on this year's profit?
No immediate effect, the margin absorbing the revision
The contractual service margin is the part of the liability holding the not-yet-earned future profit of a group of contracts. On writing a profitable group, expected profit is stored there rather than recognized, then released to the income statement as insurance service is delivered. Its second function is the one at work here: it is remeasured at each closing for changes in assumptions about future service, so a worsening in expected claims first reduces that margin, leaving profit untouched while it stays positive. It therefore acts as a shock absorber, and that is what makes reading IFRS 17 accounts different: a real deterioration can be under way without showing in the year's result. On the day the margin reaches zero, however, the group becomes onerous and any further worsening hits profit immediately and in full. The absorber removes nothing, it delays, and the useful information is how much margin is left.
Glossary entry →4. A life insurer carries liabilities with a duration of twenty years. Why does it seek assets of comparable duration?
So that its assets and liabilities react the same way to a change in interest rates
Asset-liability matching aligns the characteristics of investments with those of commitments, to control the risk that a movement in interest rates hits the two sides of the balance sheet differently. Duration, which measures the sensitivity of a cash flow to rate movements, is the instrument: bringing asset duration close to liability duration narrows the sensitivity gap and therefore rate risk. Aligning cash inflows with premium due dates describes liquidity management, a real but different problem: an insurer can have exactly the cash it needs when it needs it and still watch its solvency deteriorate because the present value of its liabilities rose faster than that of its assets. The difficulty peculiar to life insurance is that long enough assets do not always exist: commitments of thirty or forty years outrun the maturity of available bonds, leaving a gap matching cannot close and which must then be managed by other means.
Glossary entry →5. The European Investment Bank in 2004 and the World Bank in 2010 both tried to issue a longevity bond. Both attempts were cancelled. Why has this market never existed?
Because there is no natural counterparty and the risk runs in decades while investors want liquidity in years
The longevity bond was meant to transfer to capital markets the risk that policyholders live longer than expected, on the model of catastrophe bonds. Its distinction is failure: no issue ever came to market, despite two serious attempts, the European Investment Bank in 2004 and the World Bank in 2010, both cancelled for want of interest on either side. Three causes compound and are worth telling apart. Maturity mismatch first: the risk runs in decades while investors demand liquidity in years. The absence of a natural counterparty next, and this is the deepest: a catastrophe bond finds buyers because hurricane risk is uncorrelated with markets, whereas nobody structurally wishes to bet on a generation dying, leaving a one-sided market. High basis risk last, a national mortality index diverging from the actual insured population of any given pension fund.
Glossary entry →6. A reinsurer buys a cover triggered if industry insured losses from a hurricane exceed a market threshold, regardless of its own claims. What risk does it accept in exchange for that simplicity?
Basis risk, its own loss possibly differing from the industry loss
An industry loss warranty sits between reinsurance and a financial product: its trigger depends not on the buyer's loss but on the insured loss suffered by the whole industry after an event, measured by a recognized market index. Once the threshold is crossed, the seller pays an agreed amount, with no adjustment of the buyer's own file. The advantage is speed and documentary simplicity, considerable when catastrophe exposure must be covered within days. The trade-off is basis risk, the possible gap between one's own loss and the industry loss that triggers payment, and it cuts both ways: an insurer barely touched by a major hurricane collects without having suffered, while one heavily exposed in an area the industry escapes receives nothing although it pays. Counterparty risk exists too, but it is not peculiar to this instrument, whereas basis risk is its very definition.
Glossary entry →7. Between 2023 and 2025, in an insured collection of watches, wine and luxury handbags, rare whisky corrects sharply while handbags rise. What does the insurer do about these diverging paths?
It requires an annual revaluation of the agreed values
Passion assets are the collectibles that large fortunes hold both for pleasure and as diversification: the reference index published by Knight Frank tracks ten categories, art, watches, classic cars, wine, whisky, jewelry, colored diamonds and luxury handbags among them, and the very largest fortunes put on the order of seventeen percent of their wealth into them. These markets share traits that set them apart from financial assets: thin liquidity, high transaction and custody costs, expert valuation rather than continuous quotation. The consequence for insurance is direct. Such items are insured on an agreed value, a sum fixed in advance and paid without adjustment on a total loss, which assumes that sum stays close to reality. Yet the categories diverge, sometimes sharply and over few years. Periodic revaluation is therefore what stops an agreed value from becoming a fiction, in either direction.
Glossary entry →8. A reinsurer declines to cover a data center over its carbon footprint. A less scrupulous competitor picks up the capacity, with no transition conditions attached. What does this transfer show?
That exclusion does not reduce systemic risk, it moves it
The free rider is, in economics, whoever benefits from a collective good or a common decision without bearing their share of its cost or constraint. Applied to sustainable insurance, it names the less demanding insurer or reinsurer that picks up, cheaply and without conditions, a risk a peer declined or conditioned on sustainability grounds. This is the central argument against pure exclusion policies, and it is logical rather than moral in nature: withdrawing from a risk does not remove it, it hands it to more tolerant capacity that will apply no transition pressure at all. Exclusion can therefore produce the opposite of its intent, by removing from the market precisely the players who would have set conditions. It is why advocates of engagement often prefer conditional underwriting to withdrawal: staying on the contract allows you to demand things, leaving allows you nothing.
Glossary entry →9. An insurer bases its underwriting policy on financial materiality rather than a list of banned sectors. What does that choice give it?
An apolitical footing, resting on what predicts loss rather than on what is desirable
Financial materiality describes an issue with a demonstrated effect on a company's claims, performance or risk, and which therefore belongs in the analysis. Applied to environmental, social and governance criteria, it draws a sharp line between what actually predicts loss, weak governance, physical climate exposure, transition risk, pollution, and what merely expresses an ethical preference with no demonstrated link to risk. The value of this footing is that it is apolitical: it rests on observing what is risky rather than judging what is desirable, which lets it survive a change of government or a public campaign, where a list of banned sectors defends itself poorly once the wind turns. The misreading to avoid is to treat it as a retreat: exposure to fossil fuels is financially material, since it signals transition, litigation and stranded-asset risks an insurer can legitimately price.
Glossary entry →10. Proposed to the French court in 1653 by Lorenzo de Tonti, the tontine financed states for two centuries. What is its relationship to insurance?
It is its mirror image: the same mathematics, the opposite moral sign
The tontine is the mirror image of insurance, and the formulation makes it clear at once: insurance pools so that the unlucky are compensated by the lucky, the tontine pools so that survivors are enriched by the dead. The mathematics are identical, only the moral sign changes. Proposed to the French court in 1653 by Lorenzo de Tonti, it financed states for two centuries before falling into disrepute, notably in the United States where tontine-inspired policies founded the life insurance market before being regulated. Its interest today is not historical: it makes explicit what every life annuity does silently, namely that the longevity of some is financed by the disappearance of others. Contemporary retirement tontine designs in fact avoid pooling the assets themselves, using separate structures with redistribution on death, reproducing the sharing of longevity risk without the difficulties of collective ownership.
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