A conversation with an insurance agent can be surprisingly clarifying. Insurance is a business built on one simple idea: rare things still happen. Not often, and not on a schedule, but they happen. A good insurer never forgets that, and a well-run country shouldn't either.
The idea isn't new. Economists Carmen Reinhart and Kenneth Rogoff made it famous in their 2009 book This Time Is Different: Eight Centuries of Financial Folly, which studied debt defaults, banking crises, currency crashes, and runaway inflation across 66 countries. Their finding was humbling: these crises come back again and again, in clusters, and almost every time, the experts of the day insisted this time is different. (Princeton University Press) It's worth repeating, because we keep forgetting it.
What a "100-Year Flood" Actually Means
Most people hear "100-year flood" and think it happens once a century. It doesn't. It means a flood with a 1% chance of happening in any given year. That sounds small until you stretch it out. Over a 30-year mortgage, a home in that zone has roughly a 1-in-4 chance of seeing that flood at least once. A "500-year" event, with a 0.2% chance each year, is rarer, but across a whole country and a whole lifetime, someone, somewhere, gets hit.
Now imagine an insurance company that only looked at the last 30 years of flood, storm, or earthquake data. If those 30 years happened to be calm, it would underprice every policy, skimp on reserves, and look brilliant right up until the storm it never planned for wiped it out. The companies that survive are the ones that study the long record: the 100-year floods, the 500-year floods, the earthquakes, the volcanoes, and the patterns that only show up over centuries.
Economics Has 100-Year Floods Too
The economy works the same way. Every few decades, we convince ourselves the old dangers are gone:
- The late 1990s: the "new economy" meant old rules about profits and valuations no longer applied. Then the dot-com bust.
- The mid-2000s: the "Great Moderation" had supposedly tamed the business cycle, and home prices "never fall nationwide." Then 2008.
- The 2010s: inflation was considered dead, and near-zero interest rates felt permanent. Then inflation hit its highest level in about 40 years, and rates rose faster than at any time in a generation.
Each time, the last 10 to 30 years of data looked reassuring. Each time, the longer record told a different story. Rare doesn't mean impossible. It means we stopped paying attention.
The Risks We're Underpricing Right Now
Look at today's biggest decisions through an insurer's eyes:
- Debt. For most of the last 15 years, borrowing was nearly free, and Washington built its habits around that anomaly. Now the national debt is near $39 trillion and interest costs top $1 trillion a year. History is full of countries that assumed their borrowing costs would stay low forever. We've written about how America is effectively on an adjustable-rate mortgage, and about what the bond market is starting to signal.
- The dollar. The dollar's status as the world's reserve currency feels permanent because it's been true our whole lives. But reserve currencies have changed hands before. The Dutch guilder and the British pound each had their era. Ray Dalio's work on the big cycle traces exactly that pattern.
- Peace and alliances. Decades without a war between great powers can make deterrence feel optional. It isn't. It's the premium we pay so the catastrophe never comes.
- Inflation and the Fed. An independent central bank is insurance against the temptation to print money before an election. Like any policy, it only works if you keep paying the premium, even when nothing seems to be burning.
The Honest Part
We should be fair about the limits of this lesson. History doesn't repeat exactly. Some things really do change: technology, institutions, and how fast information moves. And even great economists get specific numbers wrong. A widely cited Reinhart-Rogoff finding about a debt "tipping point" was later challenged after other researchers found errors in the underlying spreadsheet. The bigger lesson of their work still holds, though, and nobody serious disputes it: crises recur, and people consistently underestimate the odds.
The point isn't to live in fear of every 500-year storm. Insurers don't panic. They prepare. They price risk honestly, keep reserves for bad years, and don't bet the company on the calm continuing.
What Common Sense Says
Run the country the way a good insurer runs its business:
- Build reserves in the good years. Run smaller deficits when the economy is strong, so there's room to respond when the storm comes. That's the whole idea behind our fiscal responsibility agenda and the balanced budget amendment.
- Stress-test for the rare event, not the average year. Plan for rates staying high, for an oil shock, for a pandemic, for a war. Not just for the last decade repeating itself.
- Keep paying the premiums. Strong alliances, an independent Fed, and a trusted dollar are policies that feel expensive in calm years and priceless in bad ones.
- Read the long history. The best lessons are often older than the people making the decisions.
Every insurance agent knows the four most expensive words in their business: "it won't happen here." In economics, the version is "this time is different." The leaders we need are the ones humble enough to learn from the 100-year floods, and disciplined enough to prepare for the next one.
Why the clock matters now: read our Why Now page →
Sources
• This Time Is Different: Eight Centuries of Financial Folly (Reinhart & Rogoff) — Princeton University Press
• This Time Is Different: A Panoramic View of Eight Centuries of Financial Crises — NBER Working Paper
• Review: This Time Is Different — Foreign Affairs